diff --git a/src/newgrf_station.cpp b/src/newgrf_station.cpp
new file mode 100644
--- /dev/null
+++ b/src/newgrf_station.cpp
@@ -0,0 +1,766 @@
+/* $Id$ */
+
+/** @file newgrf_station.c Functions for dealing with station classes and custom stations. */
+
+#include "stdafx.h"
+#include "openttd.h"
+#include "variables.h"
+#include "functions.h"
+#include "debug.h"
+#include "sprite.h"
+#include "table/sprites.h"
+#include "table/strings.h"
+#include "station.h"
+#include "station_map.h"
+#include "newgrf.h"
+#include "newgrf_callbacks.h"
+#include "newgrf_station.h"
+#include "newgrf_spritegroup.h"
+#include "date.h"
+
+static StationClass station_classes[STAT_CLASS_MAX];
+
+enum {
+	MAX_SPECLIST = 255,
+};
+
+/**
+ * Reset station classes to their default state.
+ * This includes initialising the Default and Waypoint classes with an empty
+ * entry, for standard stations and waypoints.
+ */
+void ResetStationClasses(void)
+{
+	StationClassID i;
+	for (i = 0; i < STAT_CLASS_MAX; i++) {
+		station_classes[i].id = 0;
+		station_classes[i].name = STR_EMPTY;
+		station_classes[i].stations = 0;
+
+		free(station_classes[i].spec);
+		station_classes[i].spec = NULL;
+	}
+
+	// Set up initial data
+	station_classes[0].id = 'DFLT';
+	station_classes[0].name = STR_STAT_CLASS_DFLT;
+	station_classes[0].stations = 1;
+	station_classes[0].spec = malloc(sizeof(*station_classes[0].spec));
+	station_classes[0].spec[0] = NULL;
+
+	station_classes[1].id = 'WAYP';
+	station_classes[1].name = STR_STAT_CLASS_WAYP;
+	station_classes[1].stations = 1;
+	station_classes[1].spec = malloc(sizeof(*station_classes[1].spec));
+	station_classes[1].spec[0] = NULL;
+}
+
+/**
+ * Allocate a station class for the given class id.
+ * @param classid A 32 bit value identifying the class.
+ * @return Index into station_classes of allocated class.
+ */
+StationClassID AllocateStationClass(uint32 class)
+{
+	StationClassID i;
+
+	for (i = 0; i < STAT_CLASS_MAX; i++) {
+		if (station_classes[i].id == class) {
+			// ClassID is already allocated, so reuse it.
+			return i;
+		} else if (station_classes[i].id == 0) {
+			// This class is empty, so allocate it to the ClassID.
+			station_classes[i].id = class;
+			return i;
+		}
+	}
+
+	grfmsg(2, "StationClassAllocate: already allocated %d classes, using default", STAT_CLASS_MAX);
+	return STAT_CLASS_DFLT;
+}
+
+/** Set the name of a custom station class */
+void SetStationClassName(StationClassID sclass, StringID name)
+{
+	assert(sclass < STAT_CLASS_MAX);
+	station_classes[sclass].name = name;
+}
+
+/** Retrieve the name of a custom station class */
+StringID GetStationClassName(StationClassID sclass)
+{
+	assert(sclass < STAT_CLASS_MAX);
+	return station_classes[sclass].name;
+}
+
+/** Build a list of station class name StringIDs to use in a dropdown list
+ * @return Pointer to a (static) array of StringIDs
+ */
+StringID *BuildStationClassDropdown(void)
+{
+	/* Allow room for all station classes, plus a terminator entry */
+	static StringID names[STAT_CLASS_MAX + 1];
+	uint i;
+
+	/* Add each name */
+	for (i = 0; i < STAT_CLASS_MAX && station_classes[i].id != 0; i++) {
+		names[i] = station_classes[i].name;
+	}
+	/* Terminate the list */
+	names[i] = INVALID_STRING_ID;
+
+	return names;
+}
+
+/**
+ * Get the number of station classes in use.
+ * @return Number of station classes.
+ */
+uint GetNumStationClasses(void)
+{
+	uint i;
+	for (i = 0; i < STAT_CLASS_MAX && station_classes[i].id != 0; i++);
+	return i;
+}
+
+/**
+ * Return the number of stations for the given station class.
+ * @param sclass Index of the station class.
+ * @return Number of stations in the class.
+ */
+uint GetNumCustomStations(StationClassID sclass)
+{
+	assert(sclass < STAT_CLASS_MAX);
+	return station_classes[sclass].stations;
+}
+
+/**
+ * Tie a station spec to its station class.
+ * @param spec The station spec.
+ */
+void SetCustomStationSpec(StationSpec *statspec)
+{
+	StationClass *station_class;
+	int i;
+
+	/* If the station has already been allocated, don't reallocate it. */
+	if (statspec->allocated) return;
+
+	assert(statspec->sclass < STAT_CLASS_MAX);
+	station_class = &station_classes[statspec->sclass];
+
+	i = station_class->stations++;
+	station_class->spec = realloc(station_class->spec, station_class->stations * sizeof(*station_class->spec));
+
+	station_class->spec[i] = statspec;
+	statspec->allocated = true;
+}
+
+/**
+ * Retrieve a station spec from a class.
+ * @param sclass Index of the station class.
+ * @param station The station index with the class.
+ * @return The station spec.
+ */
+const StationSpec *GetCustomStationSpec(StationClassID sclass, uint station)
+{
+	assert(sclass < STAT_CLASS_MAX);
+	if (station < station_classes[sclass].stations)
+		return station_classes[sclass].spec[station];
+
+	// If the custom station isn't defined any more, then the GRF file
+	// probably was not loaded.
+	return NULL;
+}
+
+
+const StationSpec *GetCustomStationSpecByGrf(uint32 grfid, byte localidx)
+{
+	StationClassID i;
+	uint j;
+
+	for (i = STAT_CLASS_DFLT; i < STAT_CLASS_MAX; i++) {
+		for (j = 0; j < station_classes[i].stations; j++) {
+			const StationSpec *statspec = station_classes[i].spec[j];
+			if (statspec == NULL) continue;
+			if (statspec->grfid == grfid && statspec->localidx == localidx) return statspec;
+		}
+	}
+
+	return NULL;
+}
+
+
+/* Evaluate a tile's position within a station, and return the result a bitstuffed format.
+ * if not centred: .TNLcCpP, if centred: .TNL..CP
+ * T = Tile layout number (GetStationGfx), N = Number of platforms, L = Length of platforms
+ * C = Current platform number from start, c = from end
+ * P = Position along platform from start, p = from end
+ * if centred, C/P start from the centre and c/p are not available.
+ */
+uint32 GetPlatformInfo(Axis axis, byte tile, int platforms, int length, int x, int y, bool centred)
+{
+	uint32 retval = 0;
+
+	if (axis == AXIS_X) {
+		intswap(platforms, length);
+		intswap(x, y);
+	}
+
+	/* Limit our sizes to 4 bits */
+	platforms = min(15, platforms);
+	length    = min(15, length);
+	x = min(15, x);
+	y = min(15, y);
+	if (centred) {
+		x -= platforms / 2;
+		y -= length / 2;
+		SB(retval,  0, 4, y & 0xF);
+		SB(retval,  4, 4, x & 0xF);
+	} else {
+		SB(retval,  0, 4, y);
+		SB(retval,  4, 4, length - y - 1);
+		SB(retval,  8, 4, x);
+		SB(retval, 12, 4, platforms - x - 1);
+	}
+	SB(retval, 16, 4, length);
+	SB(retval, 20, 4, platforms);
+	SB(retval, 24, 4, tile);
+
+	return retval;
+}
+
+
+/* Find the end of a railway station, from the tile, in the direction of delta.
+ * If check_type is set, we stop if the custom station type changes.
+ * If check_axis is set, we stop if the station direction changes.
+ */
+static TileIndex FindRailStationEnd(TileIndex tile, TileIndexDiff delta, bool check_type, bool check_axis)
+{
+	bool waypoint;
+	byte orig_type = 0;
+	Axis orig_axis = AXIS_X;
+
+	waypoint = IsTileType(tile, MP_RAILWAY);
+
+	if (waypoint) {
+		if (check_axis) orig_axis = GetWaypointAxis(tile);
+	} else {
+		if (check_type) orig_type = GetCustomStationSpecIndex(tile);
+		if (check_axis) orig_axis = GetRailStationAxis(tile);
+	}
+
+	while (true) {
+		TileIndex new_tile = TILE_ADD(tile, delta);
+
+		if (waypoint) {
+			if (!IsTileType(new_tile, MP_RAILWAY)) break;
+			if (!IsRailWaypoint(new_tile)) break;
+			if (check_axis && GetWaypointAxis(new_tile) != orig_axis) break;
+		} else {
+			if (!IsRailwayStationTile(new_tile)) break;
+			if (check_type && GetCustomStationSpecIndex(new_tile) != orig_type) break;
+			if (check_axis && GetRailStationAxis(new_tile) != orig_axis) break;
+		}
+
+		tile = new_tile;
+	}
+	return tile;
+}
+
+
+static uint32 GetPlatformInfoHelper(TileIndex tile, bool check_type, bool check_axis, bool centred)
+{
+	int tx = TileX(tile);
+	int ty = TileY(tile);
+	int sx = TileX(FindRailStationEnd(tile, TileDiffXY(-1,  0), check_type, check_axis));
+	int sy = TileY(FindRailStationEnd(tile, TileDiffXY( 0, -1), check_type, check_axis));
+	int ex = TileX(FindRailStationEnd(tile, TileDiffXY( 1,  0), check_type, check_axis)) + 1;
+	int ey = TileY(FindRailStationEnd(tile, TileDiffXY( 0,  1), check_type, check_axis)) + 1;
+	Axis axis = IsTileType(tile, MP_RAILWAY) ? GetWaypointAxis(tile) : GetRailStationAxis(tile);
+
+	tx -= sx; ex -= sx;
+	ty -= sy; ey -= sy;
+
+	return GetPlatformInfo(axis, IsTileType(tile, MP_RAILWAY) ? 2 : GetStationGfx(tile), ex, ey, tx, ty, centred);
+}
+
+
+static uint32 GetRailContinuationInfo(TileIndex tile)
+{
+	/* Tile offsets and exit dirs for X axis */
+	static Direction x_dir[8] = { DIR_SW, DIR_NE, DIR_SE, DIR_NW, DIR_S, DIR_E, DIR_W, DIR_N };
+	static DiagDirection x_exits[8] = { DIAGDIR_SW, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NE, DIAGDIR_SW, DIAGDIR_NE };
+
+	/* Tile offsets and exit dirs for Y axis */
+	static Direction y_dir[8] = { DIR_SE, DIR_NW, DIR_SW, DIR_NE, DIR_S, DIR_W, DIR_E, DIR_N };
+	static DiagDirection y_exits[8] = { DIAGDIR_SE, DIAGDIR_NW, DIAGDIR_SW, DIAGDIR_NE, DIAGDIR_SE, DIAGDIR_NW, DIAGDIR_SE, DIAGDIR_NW };
+
+	Axis axis = IsTileType(tile, MP_RAILWAY) ? GetWaypointAxis(tile) : GetRailStationAxis(tile);
+
+	/* Choose appropriate lookup table to use */
+	Direction *dir = axis == AXIS_X ? x_dir : y_dir;
+	DiagDirection *diagdir = axis == AXIS_X ? x_exits : y_exits;
+
+	uint32 res = 0;
+	uint i;
+
+	for (i = 0; i < lengthof(x_dir); i++, dir++, diagdir++) {
+		uint32 ts = GetTileTrackStatus(tile + TileOffsByDir(*dir), TRANSPORT_RAIL);
+		if (ts != 0) {
+			/* If there is any track on the tile, set the bit in the second byte */
+			SETBIT(res, i + 8);
+
+			/* If any track reaches our exit direction, set the bit in the lower byte */
+			if (ts & DiagdirReachesTracks(*diagdir)) SETBIT(res, i);
+		}
+	}
+
+	return res;
+}
+
+
+/* Station Resolver Functions */
+static uint32 StationGetRandomBits(const ResolverObject *object)
+{
+	const Station *st = object->u.station.st;
+	const TileIndex tile = object->u.station.tile;
+	return (st == NULL ? 0 : st->random_bits) | (tile == INVALID_TILE ? 0 : GetStationTileRandomBits(tile) << 16);
+}
+
+
+static uint32 StationGetTriggers(const ResolverObject *object)
+{
+	const Station *st = object->u.station.st;
+	return st == NULL ? 0 : st->waiting_triggers;
+}
+
+
+static void StationSetTriggers(const ResolverObject *object, int triggers)
+{
+	Station *st = (Station*)object->u.station.st;
+	assert(st != NULL);
+	st->waiting_triggers = triggers;
+}
+
+
+static uint32 StationGetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
+{
+	const Station *st = object->u.station.st;
+	TileIndex tile = object->u.station.tile;
+
+	if (st == NULL) {
+		/* Station does not exist, so we're in a purchase list */
+		switch (variable) {
+			case 0x40:
+			case 0x41:
+			case 0x46:
+			case 0x47:
+			case 0x49: return 0x2110000;       /* Platforms, tracks & position */
+			case 0x42: return 0;               /* Rail type (XXX Get current type from GUI?) */
+			case 0x43: return _current_player; /* Station owner */
+			case 0x44: return 2;               /* PBS status */
+			case 0xFA: return max(_date - DAYS_TILL_ORIGINAL_BASE_YEAR, 0); /* Build date */
+		}
+
+		*available = false;
+		return -1;
+	}
+
+	switch (variable) {
+		/* Calculated station variables */
+		case 0x40: return GetPlatformInfoHelper(tile, false, false, false);
+		case 0x41: return GetPlatformInfoHelper(tile, true,  false, false);
+		case 0x42: /* Terrain and rail type */
+			return ((_opt.landscape == LT_HILLY && GetTileZ(tile) > _opt.snow_line) ? 4 : 0) |
+			       (GetRailType(tile) << 8);
+		case 0x43: return st->owner; /* Station owner */
+		case 0x44: return 2;         /* PBS status */
+		case 0x45: return GetRailContinuationInfo(tile);
+		case 0x46: return GetPlatformInfoHelper(tile, false, false, true);
+		case 0x47: return GetPlatformInfoHelper(tile, true,  false, true);
+		case 0x48: { /* Accepted cargo types */
+			CargoID cargo_type;
+			uint32 value = 0;
+
+			for (cargo_type = 0; cargo_type < NUM_CARGO; cargo_type++) {
+				if (HASBIT(st->goods[cargo_type].waiting_acceptance, 15)) SETBIT(value, cargo_type);
+			}
+			return value;
+		}
+		case 0x49: return GetPlatformInfoHelper(tile, false, true, false);
+
+		/* Variables which use the parameter */
+		case 0x60: return GB(st->goods[parameter].waiting_acceptance, 0, 12);
+		case 0x61: return st->goods[parameter].days_since_pickup;
+		case 0x62: return st->goods[parameter].rating;
+		case 0x63: return st->goods[parameter].enroute_time;
+		case 0x64: return st->goods[parameter].last_speed | (st->goods[parameter].last_age << 8);
+		case 0x65: return GB(st->goods[parameter].waiting_acceptance, 12, 4);
+
+		/* General station properties */
+		case 0x82: return 50;
+		case 0x84: return st->string_id;
+		case 0x86: return 0;
+		case 0x8A: return st->had_vehicle_of_type;
+		case 0xF0: return st->facilities;
+		case 0xF1: return st->airport_type;
+		case 0xF2: return st->truck_stops->status;
+		case 0xF3: return st->bus_stops->status;
+		case 0xF6: return st->airport_flags;
+		case 0xF7: return GB(st->airport_flags, 8, 8);
+		case 0xFA: return max(st->build_date - DAYS_TILL_ORIGINAL_BASE_YEAR, 0);
+	}
+
+	/* Handle cargo variables (deprecated) */
+	if (variable >= 0x8C && variable <= 0xEC) {
+		const GoodsEntry *g = &st->goods[GB(variable - 0x8C, 3, 4)];
+		switch (GB(variable - 0x8C, 0, 3)) {
+			case 0: return g->waiting_acceptance;
+			case 1: return GB(g->waiting_acceptance, 8, 8);
+			case 2: return g->days_since_pickup;
+			case 3: return g->rating;
+			case 4: return g->enroute_from;
+			case 5: return g->enroute_time;
+			case 6: return g->last_speed;
+			case 7: return g->last_age;
+		}
+	}
+
+	DEBUG(grf, 1, "Unhandled station property 0x%X", variable);
+
+	*available = false;
+	return -1;
+}
+
+
+static const SpriteGroup *StationResolveReal(const ResolverObject *object, const SpriteGroup *group)
+{
+	const Station *st = object->u.station.st;
+	const StationSpec *statspec = object->u.station.statspec;
+	uint set;
+
+	uint cargo = 0;
+	CargoID cargo_type = object->u.station.cargo_type;
+
+	if (st == NULL || statspec->sclass == STAT_CLASS_WAYP) {
+		return group->g.real.loading[0];
+	}
+
+	switch (cargo_type) {
+		case GC_INVALID:
+		case GC_DEFAULT_NA:
+		case GC_PURCHASE:
+			cargo = 0;
+			break;
+
+		case GC_DEFAULT:
+			for (cargo_type = 0; cargo_type < NUM_CARGO; cargo_type++) {
+				cargo += GB(st->goods[cargo_type].waiting_acceptance, 0, 12);
+			}
+			break;
+
+		default:
+			cargo = GB(st->goods[_local_cargo_id_ctype[cargo_type]].waiting_acceptance, 0, 12);
+			break;
+	}
+
+	if (HASBIT(statspec->flags, 1)) cargo /= (st->trainst_w + st->trainst_h);
+	cargo = min(0xfff, cargo);
+
+	if (cargo > statspec->cargo_threshold) {
+		if (group->g.real.num_loading > 0) {
+			set = ((cargo - statspec->cargo_threshold) * group->g.real.num_loading) / (4096 - statspec->cargo_threshold);
+			return group->g.real.loading[set];
+		}
+	} else {
+		if (group->g.real.num_loaded > 0) {
+			set = (cargo * group->g.real.num_loaded) / (statspec->cargo_threshold + 1);
+			return group->g.real.loaded[set];
+		}
+	}
+
+	return group->g.real.loading[0];
+}
+
+
+static void NewStationResolver(ResolverObject *res, const StationSpec *statspec, const Station *st, TileIndex tile)
+{
+	res->GetRandomBits = StationGetRandomBits;
+	res->GetTriggers   = StationGetTriggers;
+	res->SetTriggers   = StationSetTriggers;
+	res->GetVariable   = StationGetVariable;
+	res->ResolveReal   = StationResolveReal;
+
+	res->u.station.st       = st;
+	res->u.station.statspec = statspec;
+	res->u.station.tile     = tile;
+
+	res->callback        = 0;
+	res->callback_param1 = 0;
+	res->callback_param2 = 0;
+	res->last_value      = 0;
+	res->trigger         = 0;
+	res->reseed          = 0;
+}
+
+static const SpriteGroup *ResolveStation(const StationSpec *statspec, const Station *st, ResolverObject *object)
+{
+	const SpriteGroup *group;
+	CargoID ctype = GC_DEFAULT_NA;
+
+	if (st == NULL) {
+		/* No station, so we are in a purchase list */
+		ctype = GC_PURCHASE;
+	} else {
+		CargoID cargo;
+
+		/* Pick the first cargo that we have waiting */
+		for (cargo = 0; cargo < NUM_GLOBAL_CID; cargo++) {
+			CargoID lcid = _local_cargo_id_ctype[cargo];
+			if (lcid != CT_INVALID && statspec->spritegroup[cargo] != NULL && GB(st->goods[lcid].waiting_acceptance, 0, 12) != 0) {
+				ctype = cargo;
+				break;
+			}
+		}
+	}
+
+	group = statspec->spritegroup[ctype];
+	if (group == NULL) {
+		ctype = GC_DEFAULT;
+		group = statspec->spritegroup[ctype];
+	}
+
+	if (group == NULL) return NULL;
+
+	/* Remember the cargo type we've picked */
+	object->u.station.cargo_type = ctype;
+
+	return Resolve(group, object);
+}
+
+SpriteID GetCustomStationRelocation(const StationSpec *statspec, const Station *st, TileIndex tile)
+{
+	const SpriteGroup *group;
+	ResolverObject object;
+
+	NewStationResolver(&object, statspec, st, tile);
+
+	group = ResolveStation(statspec, st, &object);
+	if (group == NULL || group->type != SGT_RESULT) return 0;
+	return group->g.result.sprite - 0x42D;
+}
+
+
+SpriteID GetCustomStationGroundRelocation(const StationSpec *statspec, const Station *st, TileIndex tile)
+{
+	const SpriteGroup *group;
+	ResolverObject object;
+
+	NewStationResolver(&object, statspec, st, tile);
+	object.callback_param1 = 1; /* Indicate we are resolving the ground sprite */
+
+	group = ResolveStation(statspec, st, &object);
+	if (group == NULL || group->type != SGT_RESULT) return 0;
+	return group->g.result.sprite - 0x42D;
+}
+
+
+uint16 GetStationCallback(uint16 callback, uint32 param1, uint32 param2, const StationSpec *statspec, const Station *st, TileIndex tile)
+{
+	const SpriteGroup *group;
+	ResolverObject object;
+
+	NewStationResolver(&object, statspec, st, tile);
+
+	object.callback        = callback;
+	object.callback_param1 = param1;
+	object.callback_param2 = param2;
+
+	group = ResolveStation(statspec, st, &object);
+	if (group == NULL || group->type != SGT_CALLBACK) return CALLBACK_FAILED;
+	return group->g.callback.result;
+}
+
+
+/**
+ * Allocate a StationSpec to a Station. This is called once per build operation.
+ * @param spec StationSpec to allocate.
+ * @param st Station to allocate it to.
+ * @param exec Whether to actually allocate the spec.
+ * @return Index within the Station's spec list, or -1 if the allocation failed.
+ */
+int AllocateSpecToStation(const StationSpec *statspec, Station *st, bool exec)
+{
+	uint i;
+
+	if (statspec == NULL) return 0;
+
+	/* Check if this spec has already been allocated */
+	for (i = 1; i < st->num_specs && i < MAX_SPECLIST; i++) {
+		if (st->speclist[i].spec == statspec) return i;
+	}
+
+	for (i = 1; i < st->num_specs && i < MAX_SPECLIST; i++) {
+		if (st->speclist[i].spec == NULL && st->speclist[i].grfid == 0) break;
+	}
+
+	if (i == MAX_SPECLIST) return -1;
+
+	if (exec) {
+		if (i >= st->num_specs) {
+			st->num_specs = i + 1;
+			st->speclist = realloc(st->speclist, st->num_specs * sizeof(*st->speclist));
+
+			if (st->num_specs == 2) {
+				/* Initial allocation */
+				st->speclist[0].spec     = NULL;
+				st->speclist[0].grfid    = 0;
+				st->speclist[0].localidx = 0;
+			}
+		}
+
+		st->speclist[i].spec     = statspec;
+		st->speclist[i].grfid    = statspec->grfid;
+		st->speclist[i].localidx = statspec->localidx;
+	}
+
+	return i;
+}
+
+
+/** Deallocate a StationSpec from a Station. Called when removing a single station tile.
+ * @param st Station to work with.
+ * @param specindex Index of the custom station within the Station's spec list.
+ * @return Indicates whether the StationSpec was deallocated.
+ */
+void DeallocateSpecFromStation(Station* st, byte specindex)
+{
+	/* specindex of 0 (default) is never freeable */
+	if (specindex == 0) return;
+
+	/* Check all tiles over the station to check if the specindex is still in use */
+	BEGIN_TILE_LOOP(tile, st->trainst_w, st->trainst_h, st->train_tile) {
+		if (IsTileType(tile, MP_STATION) && GetStationIndex(tile) == st->index && IsRailwayStation(tile) && GetCustomStationSpecIndex(tile) == specindex) {
+			return;
+		}
+	} END_TILE_LOOP(tile, st->trainst_w, st->trainst_h, st->train_tile)
+
+	/* This specindex is no longer in use, so deallocate it */
+	st->speclist[specindex].spec     = NULL;
+	st->speclist[specindex].grfid    = 0;
+	st->speclist[specindex].localidx = 0;
+
+	/* If this was the highest spec index, reallocate */
+	if (specindex == st->num_specs - 1) {
+		for (; st->speclist[st->num_specs - 1].grfid == 0 && st->num_specs > 1; st->num_specs--);
+
+		if (st->num_specs > 1) {
+			st->speclist = realloc(st->speclist, st->num_specs * sizeof(*st->speclist));
+		} else {
+			free(st->speclist);
+			st->num_specs = 0;
+			st->speclist  = NULL;
+		}
+	}
+}
+
+/** Draw representation of a station tile for GUI purposes.
+ * @param x, y Position of image.
+ * @param dir Direction.
+ * @param railtype Rail type.
+ * @param sclass, station Type of station.
+ * @return True if the tile was drawn (allows for fallback to default graphic)
+ */
+bool DrawStationTile(int x, int y, RailType railtype, Axis axis, StationClassID sclass, uint station)
+{
+	const StationSpec *statspec;
+	const DrawTileSprites *sprites;
+	const DrawTileSeqStruct *seq;
+	const RailtypeInfo *rti = GetRailTypeInfo(railtype);
+	SpriteID relocation;
+	PalSpriteID image;
+	PalSpriteID colourmod = SPRITE_PALETTE(PLAYER_SPRITE_COLOR(_local_player));
+	uint tile = 2;
+
+	statspec = GetCustomStationSpec(sclass, station);
+	if (statspec == NULL) return false;
+
+	relocation = GetCustomStationRelocation(statspec, NULL, INVALID_TILE);
+
+	if (HASBIT(statspec->callbackmask, CBM_CUSTOM_LAYOUT)) {
+		uint16 callback = GetStationCallback(CBID_STATION_SPRITE_LAYOUT, 0x2110000, 0, statspec, NULL, INVALID_TILE);
+		if (callback != CALLBACK_FAILED) tile = callback;
+	}
+
+	if (statspec->renderdata == NULL) {
+		sprites = GetStationTileLayout(tile + axis);
+	} else {
+		sprites = &statspec->renderdata[(tile < statspec->tiles) ? tile + axis : axis];
+	}
+
+	image = sprites->ground_sprite;
+	if (HASBIT(image, 31)) {
+		CLRBIT(image, 31);
+		image += GetCustomStationGroundRelocation(statspec, NULL, INVALID_TILE);
+		image += rti->custom_ground_offset;
+	} else {
+		image += rti->total_offset;
+	}
+
+	if (image & PALETTE_MODIFIER_COLOR) image &= SPRITE_MASK;
+	DrawSprite(image, x, y);
+
+	foreach_draw_tile_seq(seq, sprites->seq) {
+		Point pt;
+		image = seq->image;
+		if (HASBIT(image, 30)) {
+			CLRBIT(image, 30);
+			image += rti->total_offset;
+		} else {
+			image += relocation;
+		}
+
+		if ((byte)seq->delta_z != 0x80) {
+			pt = RemapCoords(seq->delta_x, seq->delta_y, seq->delta_z);
+			DrawSprite((image & SPRITE_MASK) | colourmod, x + pt.x, y + pt.y);
+		}
+	}
+
+	return true;
+}
+
+
+static const StationSpec* GetStationSpec(TileIndex t)
+{
+	const Station* st;
+	uint specindex;
+
+	if (!IsCustomStationSpecIndex(t)) return NULL;
+
+	st = GetStationByTile(t);
+	specindex = GetCustomStationSpecIndex(t);
+	return specindex < st->num_specs ? st->speclist[specindex].spec : NULL;
+}
+
+
+/* Check if a rail station tile is traversable.
+ * XXX This could be cached (during build) in the map array to save on all the dereferencing */
+bool IsStationTileBlocked(TileIndex tile)
+{
+	const StationSpec* statspec = GetStationSpec(tile);
+
+	return statspec != NULL && HASBIT(statspec->blocked, GetStationGfx(tile));
+}
+
+/* Check if a rail station tile is electrifiable.
+ * XXX This could be cached (during build) in the map array to save on all the dereferencing */
+bool IsStationTileElectrifiable(TileIndex tile)
+{
+	const StationSpec* statspec = GetStationSpec(tile);
+
+	return
+		statspec == NULL ||
+		HASBIT(statspec->pylons, GetStationGfx(tile)) ||
+		!HASBIT(statspec->wires, GetStationGfx(tile));
+}