Standardized Roadtype Scheme

Surface / Type [X***]

Describes the road surface / rail type and thus the vehicle type.

Roadtype:

Letter	Meaning (Road)	Powered Roadtypes	Recomended vehicle set fallbacks
R	Public Road / Rail	RI(S)
P	Passenger-only	RPI(S)	R
G	Guided busway	RPG	P then R
I	Industrial Site (ISR)	I	R
B	Bicycle Lane	RB(Z)	R
W	Waterway	W
A	Amphibious on road (hidden)	RPI(S)W	R
S	Snowy or Iced Track	S
a	Amphibious on snow (hidden)	SW	S
Z	Pedestrian Zone	Z
E	Eyecandy
p	Pump/Pipeline	RIZ	I then R
X	Crossover (Multiple/universal roadtypes)	n/a

Tramtype:

Letter	Meaning (Tram)	Powered Tramtypes	Recomended vehicle set fallbacks
R	Public Rail	RI(M)
P	Passenger-only	RPI(M)	R
I	Industrial Site (ISR)	I	R
B	Bicycle Lane	(R)B
S	Suspended Monorail	S
M	Metro	M(RP)
O	Trackless trams	O
E	Eyecandy/Electrical infrastructure
X	Crossover (Multiple/universal railtypes)	n/a

It is the vehicle set's responsibility to implement fallbacks to other appropriate surfaces. It is also up to the author to decide if they want to do it or not.

It is up to the track set to implement all recommended roadtypes in the powered_roadtype_list (NML). The same goes for tramtypes: powered_tramtype_list (NML). It is further advised to implement support for the roadtypes/tramtypes in brackets, if applicable.

Hidden roadtypes for compatibility should be implemented by road sets. It is up to the author to decide if they want to implement it as a hidden roadtype or not.

Speed / Feature [*X**]

Any character may be used for roads, but at least one road must have "A". it is suggested that roadtype and tramtype speeds use capital letters (A-Z) and roadtypes and tramtypes with specific features use lowercase letters (a-z). Vehicles should use "A".

Terrain / Stability [**X*]

Describes the roughness of the road surface / trackbed stability, and thus the vehicle tier.

Letter	Meaning	Powered Roadtypes
a	Very slow / rough / light	aA
A	Slow / rough / light	aAB
B	Regular	ABC
C	Fast / stable	BCc
c	Very fast / stable	Cc

Letter	Meaning	Powered Roadtypes
b	Eyecandy and other features (ONLY use if you wish for vehicles to not be able to travel on the roadtype/tramtype)	n/a

If all classes aren't defined by the road set, the other ones should be in the alternative_roadtype_list (NML). The same goes for tramtypes: alternative_tramtype_list (NML).

Road vehicle sets should not implement fallbacks for terrain / stability.

Classes "a" and "c" are entirely optional for road/tramtype sets and should under no circumstances be used by vehicles.

Energy [***X]

Describes the energy source of the track / vehicle.

Generic classes:

Letter	Meaning (Road)	Meaning (Tram)
N	None	None
i	Invisible	Invisible, Illumination (Road Lighting), Infrastructure, or Irrelevant For eyecandy and for underground infrastructure with compatibility toward certain vehicle sets, you should use EABX, EABS, EABG and EABE in the powered_roadtype_list or powered_tramtype_list for this road/tramtype
E	Overhead electrified (Catenary)	Overhead electrified (Catenary)
G	Ground electrified	Ground electrified
Z	Ground and overhead electrified	Ground and overhead electrified

Specialized classes:

Letter	Meaning (Road)	Meaning (Tram)	Vehicle set fallback
3	n/a	Third Rail	G
4	n/a	Fourth Rail	3 then G
C	n/a	Cable	G
M	n/a	Suspended Monorail	n/a
P	Pump/Pipeline	Power Line/Mains (with no lighting)	X, then S, then i, then G, then E
S	Smart infrastructure	Smart infrastructure	n/a
X	Crossover (Multiple/universal powered types)	Crossover (Multiple/universal powered types)	Z, then E, then i, then N

A road or track set that only uses specialized types, should map the generic types to the most suitable specialized type in the set.

The default labels (ROAD, ELRL)

It is up to the road set author to decide what labels should replace these, but it is recommended to choose RABN / RABE.

Vehicle set authors might need to add the default labels as a fallback. If not implemented, their vehicles won't show up on the default roads and/or tracks.