byte blocked; ///< Bitmask of base tiles (0 - 7) which are blocked to trains

	byte lengths;

	byte *platforms;

	StationLayout **layouts;

	/**

	 * NUM_GLOBAL_CID sprite groups.

	 * Used for obtaining the sprite offset of custom sprites, and for

	 * evaluating callbacks.

	 */

	SpriteGroup *spritegroup[NUM_GLOBAL_CID];

} StationSpec;

/**

 * Struct containing information relating to station classes.

 */

typedef struct StationClass {

	uint32 id;          ///< ID of this class, e.g. 'DFLT', 'WAYP', etc.

	StringID name;      ///< Name of this class.

	uint stations;      ///< Number of stations in this class.

	StationSpec **spec; ///< Array of station specifications.

} StationClass;

void SetCustomStationSpec(StationSpec *statspec);

const StationSpec *GetCustomStationSpec(StationClassID sclass, uint station);

const StationSpec *GetCustomStationSpecByGrf(uint32 grfid, byte localidx);

/* Evaluate a tile's position within a station, and return the result a bitstuffed format. */

uint32 GetPlatformInfo(Axis axis, byte tile, int platforms, int length, int x, int y, bool centred);

/* Get sprite offset for a given custom station and station structure (may be

 * NULL - that means we are in a build dialog). The station structure is used

 * for variational sprite groups. */

SpriteID GetCustomStationRelocation(const StationSpec *statspec, const Station *st, TileIndex tile);

uint16 GetStationCallback(uint16 callback, uint32 param1, uint32 param2, const StationSpec *statspec, const Station *st, TileIndex tile);

/* Check if a rail station tile is traversable. */

bool IsStationTileBlocked(TileIndex tile);

/* Allocate a StationSpec to a Station. This is called once per build operation. */

int AllocateSpecToStation(const StationSpec *statspec, Station *st, bool exec);

/* Deallocate a StationSpec from a Station. Called when removing a single station tile. */

bool DeallocateSpecFromStation(Station *st, byte specindex);

/* Draw representation of a station tile for GUI purposes. */