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...ly possible return values are 00, 02, 04 and 06. Their meaning is the same as in prop. 0E. ...ould contain. For the same reason, it uses the same cargo type in action 3 as the construction menu does (i.e., type FF if defined or else the default).

...d refit cost factor, cost base depends on the vehicle type and is the same as for the refit cost property. Negative cost factors allow refit revenue. ...llowed as an auto-refit as long as bit 4 of the miscellaneous flags is set as well.

...ormal gameplay, that means exactly four times). Can return the same values as callback 1B. Variable 40 contains the new stage. You can return FF for stag ...llbacks, if the high byte of the result is nonzero, it will be interpreted as a sound effect number, and the corresponding sound effect will be played at

|00..FE|| Display error message using D0xx (D000..D0FE) text as second line. |100..1FE|| Display error message using D0xx (D100..D1FE) text as second line.

...s, which made pure white images with sprites common in NewGRF development. As such the pure white pixel test is also a way to detect so cases where the p ...iven in the source (image or sound file) does not match the capitalization as found in the file system.

...frame should last. The value of the delay should be given in the same way as for property 1B/10/17. Decreasing the return value speeds the animation up Note: This is one of the most time consuming callbacks as it is called for every animated tile every ≈30 milliseconds. For better p

The above example will remap colour 0xC6 as 0x28, 0xC7 as 0xF5 and the range 0xC8 to 0xCD to the colours 0x0A..0x0F. This is one of t

...ic action 3 must be used. It must be processed by a VarAction2 feature 0E, as indicated in the following link: [[VarAction2NewSignals]].

...re identical to that of <code style="color:darkgreen">railtypetable</code> as described below ...ype. If the railtype SHNY is not available then trains using RT_SHINY_RAIL as track type will fallback to RAIL.

Works exactly the same way as [[Callbacks#Random production change (29) |callback 29]], except that it's

...to upgrade the current vehicle to and the vehicle variables are available as usual to decide which IDs would be appropriate to upgrade to. ...t that is available to the player and has the required minimum reliability as set by the autoreplace switch, and abort the callback sequence at this poin

|FE||continue with next frame as usual. You can return this for stages where you don't want to do anything s ...llbacks, if the high byte of the result is nonzero, it will be interpreted as a sound effect number, and the corresponding sound effect will be played at

The format is as follows. Optional parts are placed between parentheses: ...ted below, all parameters are numbers. They can be any expression, as long as they evaluate to a compile-time constant.

...anslation on every player. However, GRFs with only action 13 can be loaded as [[OpenTTD static NewGRF]]. {{grfFrom|8}} GRF version 8 alleviates this prob The data looks as follows:

...imum value is 2 (=4 ticks). The ingame length as well real length is given as rounded values for reference only, assuming normal game speed.

The following values can be used as return values for the <code style="color:darkgreen">location_check</code> c | Item can't be built, show the string as error message.

If this callback is in use, additional vehicles will be added as long as the callback says so. ...n the first vehicle contains cargo, the callback must work in the buy menu as well. This means that it will be called with cargo type FF in the action 3.

With this statement, you can deactivate other NewGRFs. As parameters, you can supply any number of grfids (4-byte strings) to deactiv

* Statistics on the NewGRF on used IDs for vehicles, houses, etc as well as available switches, parameters etc

...of the returned value is different in GRF version 7; it works the same way as [[Callbacks#Industry location permissibility (28) |callback 28]]. {{ottdp| are the same as the lowest byte of variable 18 of callback 28.

...ist_of_tiles|the tile list]] for a list of terrain sprites). The syntax is as follows: .../script.php?feature=spritesbyfile&q= OpenGFX author overview] can be used as a reference to look up these sprite numbers.

...cles ({{ottd|1.1|r21238}} Since OpenTTD r21238 for road vehicles and ships as well). ...used instead. &nbsp;For possible return values, refer to these properties as well.

...elicopter rotors, and in the future, the look of train visual effects such as steam and diesel smoke. The format of a wagon override is the same as a regular action 3 entry, with the following special considerations:

This callback is intended for limiting your type as a whole, so you can't access any industry-specific variables, just the glob |0001..00FF|| Allow construction, and use the returned value as probability for appearance on the map. (Instead of using [[Action0/Industri

...e entries for palette cycling to do some colour-animation, don't use these as regular colours. These entries are often called "action colours". ...web.archive.org/web/20121115112036/https://dev.openttdcoop.org/documents/1 as .zip.

The data looks as follows: The set of <num-sprites> and <first-sprite> is repeated as often as <num-sets> specifies.

...r it can be selected in the station construction window. &nbsp;Returning 1 as callback return indicates the station can be built, and a return code of 0

|Height above ground, top parts of locks have the same height as the lower parts. Note: this returns height in increments of 1 (and not 8) |Random byte for plain canals and river tiles, otherwise zero (under bridges as example, or old savegames)||

{{grfTill|7}} For GRF version 7 and below the return values are the same as for [[Callbacks#Industry_location_permissibility_.2828.29|callback 28]], bu {{grfFrom|8}} For GRF version 8 and above the return values are the same as for [[Callbacks#Industry_location_permissibility_.2828.29|callback 28]]. Re

...perty 16. Return 0 to do nothing, or 1 to remove the building from the map as if the town decided to destroy it. You can use this for example to remove a

<b>NOTE: As of OpenTTD 13, this feature is considered deprecated for most uses. Use var ...allback says to stop. &nbsp;All the returned variations are then displayed as refitting options, with all options that have the same cargo type and callb

...is no longer true, Action 6 will be applied both at initialization as well as activation. You can therefore use either action 7 or 9 to skip it, whicheve The data looks as follows:

...llbacks, if the high byte of the result is nonzero, it will be interpreted as a sound effect number, and the corresponding sound effect will be played at

...ype of the value depends on the property, some properties require a string as value and some an expression. For some properties you can optionally specif ...tem-block. It allows to define the graphics for a particular item, as well as various callbacks. Callbacks are used to define various things at run time,

...ter (i.e. those usually set as options in the newgrf(w).cfg file), as well as do math on them. The data looks as follows:

...ly an integer from 1 up to and including 365, so you may also define a day as a number. The values can be any value between 0 and 255. 255 means 'no snow ...le="color:darkgreen">equal</code> mode, the height of the snow is the same as the day before, unless the day is listed in the <code style="color:darkgree

...u can specify some parameter settings that the user will be able to change as part of the newgrf configuration. These can for example be used to disable This gives the parameter name as shown in the parameter configuration dialogue of OpenTTD.

...via action3) that isn't defined, your request is ignored, but not reported as an error, either. This means that if you want to conditionally define an ID |10||W||{{ottdp|1.1|no|ottdrev=r19459}}||TextID to be used as airport name

...note, though, that the text handler will see it as an array of bytes, not as an array of DWORDs, so you will have to pack two words into a register when

...ed in two ways, as generator of (partial) town names for another block, or as top-level town names block, a starting point of town names in the grf file.

...callback. A returned expression may contain variables (with the same scope as the switch block itself), parameter accesses and everything else that a nor ...style="color:darkgreen">return;</code> returns the computed value directly as a callback result. Note that the maximum value for callback results is 3251

The data looks as follows: ...ing the action 12 must be the real sprites for all glyphs, as many sprites as all <num-char> added up.

The data for Action 0 looks as follows: ...OpenTTD since r13482, extended IDs (up to 65535) can be used for vehicles as well. However there is currently a caveat that articulated parts must be be

* For vehicles, the same as above is possible. However, to facilitate the common case of having multipl * Features not mentioned here have no use for sprite sets, as such they are not supported by NML.

...feature this action 3 associates graphics with. There must be as many IDs as &lt;n-id&gt; specifies ...he following ones are for sloped rivers where slopes follow the same order as for id5 (river slopes).

.... (A failed callback terminates the list, too.) The same limitations apply as for callback 14A: industry tiles aren't yet placed, and some industry varia In both cases return FFh as the last element to terminate the lists.

# To keep the numbers more manageable, the classes are as generic as possible. |STRU||Structures||Multitile engineered objects that don't quite fit in as industries, houses or stations - dams etc.

...lable resources, check whether certain IDs are available, and/or mark them as reserved. Then, an action 6 will enter the actual values in the appropriate ...vated and be shown with an orange colour in the GRF Status Window, as well as a message indicating the type of resource that was not available. Note that

|41||B||{{ottdp|0.6|2.5}}||Ground type, the same as variable 81 for [[VarAction2Canals|canals]] ...|0.6|2.5}}||The tile is an industry tile, and belongs to the same industry as the current one

...valid palette. You can chose either the default (DOS) palette (recommended as it contains a few more colours) or the legacy (windows) palette.

The data looks as follows: ...The first fatal message during each activation is shown as a red popup box as well.

|&lt;xofs&gt;||B||x-offset from northern tile corner (as a signed byte) |&lt;yofs&gt;||B||y-offset from northern tile corner (as a signed byte)

The data looks as follows:

#Pad with zeroes from the left until you have twice as many digits as you need bytes (i.e. 4 digits for W, 8 digits for D) Strings are written as individual characters in hex codes, with a final 00 to indicate the end of

...l changes to existing behaviour, among others: changing vehicleIDs as well as some of their properties, changing industry layouts, railtype compatibility

...e's a special parameter, 254: That reports back the version of that NewGRF as set in its grf definition (e.g. via the version property in the [[NML:GRF|

...ill|7}} For GRF version 7 or earlier, setting property 09 sets property 1B as well.</ref>--> ...y 1B ''after'' setting property 09, as property 09 sets the rail type name as well for backwards compatibility.</ref>-->

...ill|7}} For GRF version 7 or earlier, setting property 09 sets property 1B as well.</ref>--> ...y 1B ''after'' setting property 09, as property 09 sets the rail type name as well for backwards compatibility.</ref>-->

An advanced VarAction2 looks as follows: ...riable> and <varadjust> pair. &nbsp;This sequence may be repeated as often as necessary, by setting the appropriate bit in the previous <varadjust> (see

...in the NewGRF specs wiki should try to follow a common style. Headings are as follows: Note: section headings are indicated by == otherwise they have the same size as the page title

...can make the selection depend on source and destination industries as well as service distance among other things. |40||D||xxxxxxTT, TT=cargo slot from cargo translation table or same as var.81 if no table, available since r1167/2.5b9

The data looks as follows: The meaning of this byte depends on the GRF version of the .grf file as set in [[Action8#version|action 8]].

...ion goes below the quarter of the default, the industry is closed instead, as if you returned 03.|| |04||{{ottdp| | }}||Do the standard random production change as if this industry was a primary one.||

...rmat of ss0t where t is the terrain type which the tile is on, same values as [[VarAction2Canals|canal var81]]. As of TTDPatch r2088, ss contains the slope data of the tile, same format as for [[VarAction2IndustryTiles#Land info of nearby tiles (60)|industrytile v

|00..FC||Disallow attaching and use the D0xx (D000..D0FC) text ID as second line of an error message, |00..3FF||Disallow attaching and use the D0xx (D000..D3FF) text ID as second line of an error message,

The syntax is as follows:

...ime, several features have been added to OpenTTD that require new sprites. As these sprites are not present in the original base graphics and only found <!-- This is not usable anyway, as NML 0.3 is grf v8

The data looks as follows: Here you give the list of GRFIDs, in the same format as in [[Action8]], which should be deactivated.

...e new style callbacks. Thus all callback_flag properties have been removed as have the callback flag constants *CBF*. For a complete list of affected con ...more and different zoom level arguments and a type argument has been added as 8bpp sprites are now also permissible. See the description of the [[NML:Alt

{{grfTill|7}} For GRF version 7 and below the return values are the same as for [[Callbacks#Industry_location_permissibility_.2828.29|callback 28]], bu {{grfFrom|8}} For GRF version 8 and above the return values are the same as for [[Callbacks#Industry_location_permissibility_.2828.29|callback 28]]. Re

...versed sprites in the vehicle's varaction 2 chain, but this is inefficient as it typically causes sprites to be duplicated in the grf.

This callback is called for all vehicles and as generic callback for bridges, for various events that support playing sound |10||Bridge sound, called as generic feature 06 callback every time a consist moves on a bridge. Variabl

The data looks as follows: ...red, it is valid to use the value "80" for the ID of the American language as well, but putting it first in the list is the preferred way of defining it.

...red in a byte, 0 meaning 0% and 255 meaning 100%. The rating is calculated as the sum of the following components: ...orry about calculated callback results yielding a negative result, as long as you stay in the range -16384..16383). During the callback, variable 18 has

Action 01 is used to define sets of real sprites (as opposed to pseudo-sprites). It can be put anywhere in the .nfo file after [ This behaviour of Action1 applies to both the basic as well as the extended format.

Note: that these are the same bits as would be used to order action5 block type 4. |8-15||Low half of L3 of tile, bits 4-7 bitmask of which signals present as shown below, bits 0-3: track type

The date is specified as number of days since 1920 where TTD counts 365,25 days in a year. It will h ...new game, a random amount between 31 months and 17 years is added to this as well.

| Same as above, but tests whether the grf will become active instead of whether it's | Same as above, but tests whether current grf will become active in the order behind

|<operation>||B||As for ActionD, but only assignment is valid. All map sizes will be substracted by 6, as to keep the size 64 the smallest one, thus zero based

...of the aircraft you have to use varaction2 type 82/86/8A (related object), as most variables are not valid for the mail compartment.

...the industry starts with after construction. Accessible via RandomAction2 as well. This callback must return a 15-bit value, which is interpreted as follows:

You may note that this is the same as the action2 entry for vehicles, but with num_loadtypes=1 and num_loadingtyp ...o the most recent action1 set. For example, action1 set 3 would be encoded as 03 00. Note the additional 00 which is needed because it must be a word val

...ill|7}} For GRF version 7 or earlier, setting property 09 sets property 1B as well.</ref> ...y 1B ''after'' setting property 09, as property 09 sets the rail type name as well for backwards compatibility.</ref>

The data looks as follows: This defines the number of this action 2. &nbsp;The ID can then be used as target in an action 3 or another variational/random action 2.

...than passengers on trains and planes, instead the capacity is used exactly as returned by the callback. See also the summary page about [[VehicleRefittin

...the pre-compiled binary file), you should install these libraries as well as NML itself using <code style="color:darkgreen">python setup.py install</cod macOS users have two choices: install the dependencies manually as described in the Linux section above, for use with the python version that

In a VarAction2, the variable value has been computed as <value>, and <adjusted> will be used after shift/and/add/mod/div adjustment |other||1324 (4900) Note: this includes all features not listed below as well as GRM sprite allocations

|&lt;xofs&gt;||B||x-offset from northern tile corner (as a signed byte) |&lt;yofs&gt;||B||y-offset from northern tile corner (as a signed byte)

...r higher. It is recommended to set the 'number'-property to the same value as the item ID. | String to use as cargo type name. Example: "Passengers". The list of [[NML:Default_TTD_strin

...nly: they are used to pass extra data to some 4x and 6x variables, as well as for returning extra data from callbacks.

| ||empty tag, written as {} is used to create a newline || ...t'd be seen as the start of a tag and the rest of the string would be read as name of the tag. ||

...feature this action 3 associates graphics with. There must be as many IDs as &lt;n-id&gt; specifies ...counted from the first of their class, i.e. the first road vehicle has 00, as does the first plane, the first ship, and the first train vehicle.

| 1 if this town is marked as a "city", 0 if it's not.

If you always return 1 from this callback, you achieve the same effect as turning on bit 1 of property 19. When this callback is enabled, bit 1 of pr

...tyle="color:darkgreen">produce_cargo</code> are cargolabels (unescaped/not as a string) for a cargo that will be consumed/produced from the industry duri * Amount of GIFT produced is the same as amount of TOYS and SWTR consumed.

The return value has the same values as [[VariationalAction2/Objects#Tile information (41)|object var41]]. The return value has the same values as [[VariationalAction2/Vehicles#Player info (43)|vehicle var43]].

...ing them before the first building sprite, they will have no bounding box, as if they would use the 'bounding box' of the ground tile. Multiple childspri ...ruction_state);</code> to use the construction state to select the sprite (as is the default). If the spriteset has labels defined, you can use these lab

| Industry as a whole | Industry (same as above)

The data looks as follows: The size of <varadjust> depends on <type> as well as the adjustments to be performed and must always provide an AND mask. For <t

The data looks as follows:

...f, the available and the position of the individual town zones thus change as a town grows:

Currently, the scheme is to use international phone codes as language IDs, unless they're out of range. When creating a new translation ...d the type of [[StringCodes#Using_plural_forms|plural form]] is only given as reference.

...rnmost (north being the top of the screen) edge of the industry or airport as a whole. A typical example looks like:

This variable works the same way as var. 8B does during callback 28: if your industry is built on water, it giv ...ves up looking for a good tile. Try to avoid it in frequent callbacks such as the production callback, animation callbacks (unless the animation is slow,

...de sprites for glyphs that don't have sprites in normal TTD. The syntax is as follows:

These labels are used for the trains and tracks in the base game, as well as for train sets that are not rail-type-aware. Consequently, track NewGRFs sh Note: Please use the same label for tram types which already exist as rail types.

...feature this action 3 associates graphics with. There must be as many IDs as &lt;n-id&gt; specifies ...counted from the first of their class, i.e. the first road vehicle has 00, as does the first plane, the first ship, and the first train vehicle.

...s and Roadtypes share a pool of 63 IDs. Either feature can use as many IDs as needed (i.e. it is not limited to 32 per type), but both features combined | Caption of the build tram toolbar. In earlier versions this is the same as the 'name'

The data looks as follows: ...inordinately curious, the actual encoding of a binary include is the same as a pseudosprite:

The data is provided using nestable chunks, and looks as follows: ...r GRFs with the same GRFID. That order will determine which GRF is loading as "compatible" GRF and which GRFs to show in the list of GRFs. By default a G

...e file will behave slightly differently depending on whether it's declared as version 06, 07 or 08. These changes are described in more detail in the pag In principle, you are free what to use for the GRFID as long as you are sure it is unique, but generally it is best to follow the above gui

...case, but you can still use variable AAh; the low byte is always zero here as well. The default behaviour is trying to cut a tree every 512 ticks.

...ttdprev=r2340}}||Object build cost factor (sets object removal cost factor as well) ...ID for the object for query and selection (word value). Same requirements as for property09.

...ked even if the callback returns a nonzero value; they can cancel building as well.

These are pretty easy to set, as long as you remember that the order is X, Y, Y, X, and not X, Y, X, Y. It is generally a bad idea to use any other value, as that may cause problems. FF is an especially bad idea.

...and can be used with string codes 80/81 to show texts from the D8xx range as well, extending the available unique strings.

...callback 152]], simply set the wanted bits in property 11 and it will work as intended. The meaning is the same as for house property 1B, but the lower limit is 0 instead of 2, so the fastes

...church / stadium flags (see below). The old house must have the same size as the new house, see the list of [[NML:List_of_default_house_properties|defau ...all probabilities are defined as 16, they'll all have the same probability as if they had all a probability of 1.

...s and Tramtypes share a pool of 63 IDs. Either feature can use as many IDs as needed (i.e. it is not limited to 32 per type), but both features combined | Per piece of road as multiplier to PR_BUILD_ROAD base cost. Default cost factors are 8 and 16 fo

...uld set the appropriate axle weight for each train via the railtype label, as to make the set work with track sets that do provide tracks with different ...t, it doesn't really matter what axle load class you choose for the track, as you'll be mapping all other classes to this track anyways. But the lowest o

...feature this action 3 associates graphics with. There must be as many IDs as &lt;n-id&gt; specifies ...counted from the first of their class, i.e. the first road vehicle has 00, as does the first plane, the first ship, and the first train vehicle.

...xisting 12 cargos per climate, and allows adding 20 new cargos per climate as well. These cargo slots are numbered from 0 to 31, where slots 0-11 are use ...that no active GRFs support the toyland climate, you can use values 11-1A as well.

For vehicles, the data looks as follows: Same as num-loadtypes, except this is used while the vehicle is loading or unloadin

...ion cb using var 0C. &nbsp;Do not rely on handling production cb sub-chain as default ID for the varaction 2 checking 0C, this can have unexpected result For the production callback, the action 2 data looks as follows:

The data looks as follows: ...||* can't skip a livery override without skipping the main engine action 3 as well

As of r1908, text IDs D100..D3FF may also be returned.

...via action3) that isn't defined, your request is ignored, but not reported as an error, either. This means that if you want to conditionally define an ID ...stry tile IDs are unique within each grf file. The per-GRF ID is specified as a byte, which means no GRF can define more than 256 tile IDs. You should us

...which cargo types should trigger re-randomizing. The cargo types are given as a bitmask of the bits from column 3 (type B) in CargoTypes. &nbsp;If nothin The meaning is the same as for [[Action0Houses#Animation Speed 1B|house property 1B]], but the lower l

...the second byte of the matching entry has to have bit 7 set to identify it as a callback result. {{grfTill|7}} For GRF version 7 and below not all 15 bit values are available as return values, only values between 00 and 7EFF.

...feature this action 3 associates graphics with. There must be as many IDs as &lt;n-id&gt; specifies ...counted from the first of their class, i.e. the first road vehicle has 00, as does the first plane, the first ship, and the first train vehicle.

...1.2|2.5|ottdrev=r22848|ttdprev=2.5 beta 2}} Available in the purchase list as well.</ref>||{{ottdp|1.2|2.5|ottdrev=r22848}}||D||Player info, see [[VarAct ...over existing tiles, the var. 41 information of surrounding tiles changes as well, due to an internal limitation in how it is stored.

|||{{ottdp|1.2|ottdrev=r22778}}||9A 16 Print dword as date (day, month, year) (based on year 0) |||{{ottdp|1.2|ottdrev=r22778}}||9A 17 Print dword as short date (month and year) (based on year 0)

...your item. For airports, there only is an 'override'-property, which acts as a combined substitute and override. The following variables require a signed x,y offset as parameters. The offset is relative to the current tile. Offset 0,0 means th

| Decide the time an animation frame should last. Return value is interpreted as (num_ticks = 2^anim_speed), which each tick lasting 30 ms. Avoid using this Same as for the [[#Location check results|location_check]] industry callback

|05||B||{{ottdp|1.10|no}}||Roadtype / tramtype (see below)||should be same as front ...rev=alpha 58}}||Miscellaneous vehicle flags||partly ("tram" should be same as front)

...5|ottdrev=r22816|ttdprev=alpha 61}} Valid for wagons and articulated parts as well.||no |bb||same as ff, but counted from the end, i.e. the last wagon has bb=0, the next-to-las

...he unit used was about 1 mph/tick, so aircraft accelerated more than twice as fast. Also values bigger than 19 failed.</ref> ...m Action11 sound effects for helicopers. Default sound effects are ignored as before.

7073 \0f\98World Recession!\0d\0dFinancial experts fear worst as economy slumps! ...\0f\98Recession Over!\0d\0dUpturn in trade gives confidence to industries as economy strengthens!

...ill define graphics for mail, and bit 3 in the refit mask will be for mail as well. .... Each of them can have IDs 0-18 (decimal), the IDs being ordered the same as in the Currency drop-down list.

...The goal is for a basic roadtype set to cover as many standardized labels as is appropriate, and leave the more niche uses of the system to another set. ...y road sets. It is up to the author to decide if they want to implement it as a hidden roadtype or not.

* Copy the vehicle which shall be changed and add it as a new vehicle with a new, so-far unused ID

...the building count is at least one, since the current building is counted as well. ...e construction check (17)|callback 17]], you may need to check variable 45 as well and make adjustments if this bit is set.

...are drop-in replacements for some real sprites in your grf. The syntax is as follows: ...use for mask sprites. These (8bpp) sprites have the same size and offsets as the normal sprites and are used for recolouring purposes. See the [[NML:Rea

| <code>extra_text</code> should be the parameter number written out as string. {COMMA} is replaced by the value of <code>parameter1</code>

...g the GRF version of a GRF is likely to affect the operativity of a NewGRF as it might change the behaviour of various NewGRF features. ...RF specs various features were designed, implemented and redesigned again. As such GRF version 2 is the first stable version of the specs.

As such action 4 is not allowed to change any original strings in OpenTTD; tra ...internally have a number in this region, even though they aren't text IDs as such.)

...llbacks, if the high byte of the result is nonzero, it will be interpreted as a sound effect number, and the corresponding sound effect will be played at

| Build and clear cost multipliers, 16 is the same as a non-NewGRF road stop ...max. speed is above 255 speed units, 255 is used instead. 0 if no vehicle as picked up the cargo type yet.

| Yes <ref name=readwrite>These variables can be written as well as read. Use a normal assignment, for example:

...the base sets. These translation tables will translate the 'brownish red' as used in the default bridges to the colour you specify. :4366 translates to 0E 11 in little endian value and as such to 0E 11 00 00 in a dword. In order to convert to yellow you'll have t

The data looks as follows: ...-sprites sprites in the .nfo file have to be RealSprites that will be used as graphics for the given TTDPatch feature, except for type 0A, which requires

You may simply use other classes than the above, as long as no more than (at the moment) 16 classes are used among all active .grf file The data is specified as data for all eight tiles in this way:

...}} Caption of the build rail toolbar. In earlier versions this is the same as the 'name' | max curve speed is defined as multiple of the base curve speed (see below)

* This is great as long as the section remains regular. The picture shows the perspective of each tile of a irregular section as "(platform, position)/(num-platforms, length)":

...anslated" cargo slots), for historical reasons. This method is deprecated as it meant relying blindly on cargos always using the same slots. You can se ..., covered/sheltered <ref name="ecs_cargo_change">ECS cargo classes changed as of Dec 31, 2010</ref>

...e wagon. We will attempt this with as few exceptions from the class system as possible. |<ref name="ecs_cargo_change">ECS cargo classes changed as of Dec 31, 2010</ref>

For stations, the data looks as follows:

...ttdp|1.2|2.5|ttdprev=alpha 44|ottdrev=r22639}}||Canal speed fraction, same as above but for canals and rivers ...setting the corresponding bit in properties 12 and 22 (certain other, not as frequently used callbacks are available without setting a bit here):

...e old type. Only set this property if your type is (more or less) the same as the old type. # <code>accept_cargo("PASS")</code> specifies the industry accepts PASS as a "black hole", that is no cargo is produced when PASS is delivered. If you

In general, the data looks as follows. Some features use a different syntax though (see table below).

...ns, the modifier for terraforming will also apply to building foundations, as that was the base cost used before the new one was added. ...me, but that is a property of the place where it's used, not the base cost as such.

|00||80|| ||W||{{ottdp|0.6|2.0}}||current date (counted as days from 1920)<ref name="startdate">{{ottdp|0.7}} In multiplayer games Ope ...rfFrom|8}} for GRF version 8 and above they directly state the heightlevel as multiple of 1.</ref>

...ID whose property 08 isn't set, your request is ignored, but not reported as an error, either. ...our new building, so you don't have to change properties that are the same as the substitute.

|05||B||{{ottdp|0.6|2.0}}||Track type (see below)||should be same as front ...6|2.5}} {{grfFrom|6}}||Set visual effect type (steam/smoke/sparks) as well as position, see below||yes

...via action3) that isn't defined, your request is ignored, but not reported as an error, either. This means that if you want to conditionally define an ID ...operty 09. This will ensure that other industries don't consider your type as a coal mine.

...be exactly 19 characters long, and must contain letters that are available as shortened first names of AI company managers like "C. F. Watkins".

| Decide the time an animation frame should last. Return value is interpreted as (num_ticks = 2^anim_speed), which each tick lasting 30 ms. Avoid using this ...0, 8)</code>: Colour scheme of the constructing company in the same format as the return value, or random colours if not available (scenario editor). If

...a depot), visits a station or on loading of a saved game. Other ones such as TE are called every time a TE calculation is run.

| Length of the animation frame as defined in the apendix. This is a very expensive callback and try to avoid | accepted cargo types as entry in the CTT. Bits 0...4: 1st cargo, bits 5 ... 9: 2nd cargo, bits 10 .

| As of NML 0.3, do not use this. Use cargo_[dis]allow_refit (see below) instead ...property value is the ID of another vehicle in the same GRF which will act as the parent for vehicles in the group.

...applies to TTDPatch. OpenTTD has different error messages which are shown as plain text without numeric error codes.

The parameter of this variable has the same format as for variables 60..65. The returned value looks like this:

...al) or trgc.grf (sub-arctic) and thus marked. All sprite numbers are given as decimal numbers.

...an action 0, most often for trains. Attempting to read the recolor sprite as an action 0 will usually reveal that there are far too many bytes. Another

As a general rule, industries that don't appear in the given climate have chan

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