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Sprite types

Action0 - Defines new properties for anything added or changed by the NewGRF

0	Vehicles	Trains	RoadVehicles	Ships	Aircraft
	Stations	Canals & Rivers	Bridges	Houses	Global Settings
	Industry Tiles	Industries	Cargos	Sound Effects	Airports
	Signals	Objects	Railtypes	Airport Tiles	Roadtypes
	Tramtypes	Towns

Action1 - Defines one or more graphics sets

Action2 - Defines graphics set IDs

• Basic Action2

2	Vehicles
	Stations	Canals & Rivers	Bridges	Houses	Global Settings
	Industry Tiles	Industries	Cargos	Sound Effects	Airports
	Signals	Objects	Railtypes	Airport Tiles	Roadtypes
	Tramtypes	Towns

• VariationalAction2 - A conditional switch that determines a callback result or chains to another Action 2

VarAction2Advanced - Advanced features of Variational Action 2

Global Variables

VA2	Vehicles
	Stations	Canals & Rivers	Bridges	Houses	Global Settings
	Industry Tiles	Industries	Cargos	Sound Effects	Airports
	Signals	Objects	Railtypes	Airport Tiles	Roadtypes
	Tramtypes	Towns

• RandomAction2 - A randomized Variational Action 2

R	Vehicles
	Stations	Canals & Rivers	Bridges	Houses	Global Settings
	Industry Tiles	Industries	Cargos	Sound Effects	Airports
	Signals	Objects	Railtypes	Airport Tiles	Roadtypes
	Tramtypes	Towns

• Callbacks - List of available callbacks

Action3 - Associates Action 2s with an Action 0

3	Vehicles
	Stations	Canals & Rivers	Bridges	Houses	Global Settings
	Industry Tiles	Industries	Cargos	Sound Effects	Airports
	Signals	Objects	Railtypes	Airport Tiles	Roadtypes
	Tramtypes	Towns

Action3LiveryOverride - Change wagon livery to match the engine

Action4 - Defines text strings

Action5 - Replaces base set sprites not present in the original TTD.

Action6 - Modifies the contents of the following sprite

Action7 - Conditionally skips sprites or jumps to a label

GameConfigFlags - Configuration flags for Action 7/9 Variable 85

Action8 - Defines GRFID, Name and Description

Action9 - (see action 7 above)

ActionA - Replaces TTD base set sprites

ActionB - Generates an error message

ActionC - Does nothing (can be used to embed comments)

ActionD - Assigns parameters and calculates results

• ReadingOtherGRFParameters - Reading another GRF file's parameters
• ReadingGameSettings - Reading game configuration settings
• GRFResourceManagement - Preventing conflicts with limited resources

ActionE - Deactivates a NewGRF file

ActionF - Defines new town name styles

Action10 - Defines a label for action 7/9

Action11 - Defines new sounds

Action12 - Adds Unicode font glyphs

Action13 - Translates GRF-specific strings

Action14 - Static NewGRF information (OpenTTD only)

RealSprites - Sprites that actually are drawn on the screen

RecolorSprites - Changing other sprites' colors

Graphics properties

• Palettes - Palettes used by the game
• Coordinates - Coordinates used for sprite alignement

TTD defaults

• DefaultHouseProps - Default property values for TTD's houses
• IndustryTileDefaultProps - Default property values for TTD's industry tiles
• IndustryDefaultProps - Default properties values for TTD's industries
• CargoDefaultProps - Default property values for TTD's cargo types
• VehicleIDs - Default vehicle IDs
• NML:Default_Vehicle_Properties - Default Vehicle Properties (NML)
• AirportTypes - Default Airport IDs
• AirportTileDefaultProps - Default airport tile properties

NewGRF commons

• Cargo classes - Commonly used cargo classes
• Cargo labels - Commonly used cargo labels
• Object classes - Commonly used object clases
• Railtype labels - Commonly used railtype labels

Misc

• Features - List of all features and feature-specific actions.
• Base Costs
• Vehicle Refitting
• GRF loading stages
• Global variables
• Storages
• String control codes
• Text IDs (TTD + TTDPatch + NewGRF defined)
• Syntax details
• Types of version numbers used throughout the specs
• Debugging NewGRFs
• TTDPatch error codes on loading NewGRFs

Game mechanics

• Town zones
• NML