--- a/src/rail.cpp	Thu Jan 11 13:41:16 2007 +0000
+++ b/src/rail.cpp	Mon Jan 15 20:14:06 2007 +0000
@@ -10,41 +10,41 @@
 /* XXX: Below 3 tables store duplicate data. Maybe remove some? */
 /* Maps a trackdir to the bit that stores its status in the map arrays, in the
  * direction along with the trackdir */
-const byte _signal_along_trackdir[] = {
+extern const byte _signal_along_trackdir[] = {
 	0x80, 0x80, 0x80, 0x20, 0x40, 0x10, 0, 0,
 	0x40, 0x40, 0x40, 0x10, 0x80, 0x20
 };
 
 /* Maps a trackdir to the bit that stores its status in the map arrays, in the
  * direction against the trackdir */
-const byte _signal_against_trackdir[] = {
+extern const byte _signal_against_trackdir[] = {
 	0x40, 0x40, 0x40, 0x10, 0x80, 0x20, 0, 0,
 	0x80, 0x80, 0x80, 0x20, 0x40, 0x10
 };
 
 /* Maps a Track to the bits that store the status of the two signals that can
  * be present on the given track */
-const byte _signal_on_track[] = {
+extern const byte _signal_on_track[] = {
 	0xC0, 0xC0, 0xC0, 0x30, 0xC0, 0x30
 };
 
 /* Maps a diagonal direction to the all trackdirs that are connected to any
  * track entering in this direction (including those making 90 degree turns)
  */
-const TrackdirBits _exitdir_reaches_trackdirs[] = {
+extern const TrackdirBits _exitdir_reaches_trackdirs[] = {
 	TRACKDIR_BIT_X_NE | TRACKDIR_BIT_LOWER_E | TRACKDIR_BIT_LEFT_N,  /* DIAGDIR_NE */
 	TRACKDIR_BIT_Y_SE | TRACKDIR_BIT_LEFT_S  | TRACKDIR_BIT_UPPER_E, /* DIAGDIR_SE */
 	TRACKDIR_BIT_X_SW | TRACKDIR_BIT_UPPER_W | TRACKDIR_BIT_RIGHT_S, /* DIAGDIR_SW */
 	TRACKDIR_BIT_Y_NW | TRACKDIR_BIT_RIGHT_N | TRACKDIR_BIT_LOWER_W  /* DIAGDIR_NW */
 };
 
-const Trackdir _next_trackdir[] = {
+extern const Trackdir _next_trackdir[] = {
 	TRACKDIR_X_NE,  TRACKDIR_Y_SE,  TRACKDIR_LOWER_E, TRACKDIR_UPPER_E, TRACKDIR_RIGHT_S, TRACKDIR_LEFT_S, INVALID_TRACKDIR, INVALID_TRACKDIR,
 	TRACKDIR_X_SW,  TRACKDIR_Y_NW,  TRACKDIR_LOWER_W, TRACKDIR_UPPER_W, TRACKDIR_RIGHT_N, TRACKDIR_LEFT_N
 };
 
 /* Maps a trackdir to all trackdirs that make 90 deg turns with it. */
-const TrackdirBits _track_crosses_trackdirs[] = {
+extern const TrackdirBits _track_crosses_trackdirs[] = {
 	TRACKDIR_BIT_Y_SE     | TRACKDIR_BIT_Y_NW,                                                   /* TRACK_X     */
 	TRACKDIR_BIT_X_NE     | TRACKDIR_BIT_X_SW,                                                   /* TRACK_Y     */
 	TRACKDIR_BIT_RIGHT_N  | TRACKDIR_BIT_RIGHT_S  | TRACKDIR_BIT_LEFT_N  | TRACKDIR_BIT_LEFT_S,  /* TRACK_UPPER */
@@ -54,7 +54,7 @@
 };
 
 /* Maps a track to all tracks that make 90 deg turns with it. */
-const TrackBits _track_crosses_tracks[] = {
+extern const TrackBits _track_crosses_tracks[] = {
 	TRACK_BIT_Y,    /* TRACK_X     */
 	TRACK_BIT_X,    /* TRACK_Y     */
 	TRACK_BIT_VERT, /* TRACK_UPPER */
@@ -65,12 +65,12 @@
 
 /* Maps a trackdir to the (4-way) direction the tile is exited when following
  * that trackdir */
-const DiagDirection _trackdir_to_exitdir[] = {
+extern const DiagDirection _trackdir_to_exitdir[] = {
 	DIAGDIR_NE,DIAGDIR_SE,DIAGDIR_NE,DIAGDIR_SE,DIAGDIR_SW,DIAGDIR_SE, DIAGDIR_NE,DIAGDIR_NE,
 	DIAGDIR_SW,DIAGDIR_NW,DIAGDIR_NW,DIAGDIR_SW,DIAGDIR_NW,DIAGDIR_NE,
 };
 
-const Trackdir _track_exitdir_to_trackdir[][DIAGDIR_END] = {
+extern const Trackdir _track_exitdir_to_trackdir[][DIAGDIR_END] = {
 	{TRACKDIR_X_NE,     INVALID_TRACKDIR,  TRACKDIR_X_SW,     INVALID_TRACKDIR},
 	{INVALID_TRACKDIR,  TRACKDIR_Y_SE,     INVALID_TRACKDIR,  TRACKDIR_Y_NW},
 	{TRACKDIR_UPPER_E,  INVALID_TRACKDIR,  INVALID_TRACKDIR,  TRACKDIR_UPPER_W},
@@ -79,7 +79,7 @@
 	{TRACKDIR_RIGHT_N,  TRACKDIR_RIGHT_S,  INVALID_TRACKDIR,  INVALID_TRACKDIR}
 };
 
-const Trackdir _track_enterdir_to_trackdir[][DIAGDIR_END] = { // TODO: replace magic with enums
+extern const Trackdir _track_enterdir_to_trackdir[][DIAGDIR_END] = { // TODO: replace magic with enums
 	{TRACKDIR_X_NE,     INVALID_TRACKDIR,  TRACKDIR_X_SW,     INVALID_TRACKDIR},
 	{INVALID_TRACKDIR,  TRACKDIR_Y_SE,     INVALID_TRACKDIR,  TRACKDIR_Y_NW},
 	{INVALID_TRACKDIR,  TRACKDIR_UPPER_E,  TRACKDIR_UPPER_W,  INVALID_TRACKDIR},
@@ -88,7 +88,7 @@
 	{INVALID_TRACKDIR,  INVALID_TRACKDIR,  TRACKDIR_RIGHT_S,  TRACKDIR_RIGHT_N}
 };
 
-const Trackdir _track_direction_to_trackdir[][DIR_END] = {
+extern const Trackdir _track_direction_to_trackdir[][DIR_END] = {
 	{INVALID_TRACKDIR, TRACKDIR_X_NE,     INVALID_TRACKDIR, INVALID_TRACKDIR,  INVALID_TRACKDIR, TRACKDIR_X_SW,     INVALID_TRACKDIR, INVALID_TRACKDIR},
 	{INVALID_TRACKDIR, INVALID_TRACKDIR,  INVALID_TRACKDIR, TRACKDIR_Y_SE,     INVALID_TRACKDIR, INVALID_TRACKDIR,  INVALID_TRACKDIR, TRACKDIR_Y_NW},
 	{INVALID_TRACKDIR, INVALID_TRACKDIR,  TRACKDIR_UPPER_E, INVALID_TRACKDIR,  INVALID_TRACKDIR, INVALID_TRACKDIR,  TRACKDIR_UPPER_W, INVALID_TRACKDIR},
@@ -97,12 +97,12 @@
 	{TRACKDIR_RIGHT_N, INVALID_TRACKDIR,  INVALID_TRACKDIR, INVALID_TRACKDIR,  TRACKDIR_RIGHT_S, INVALID_TRACKDIR,  INVALID_TRACKDIR, INVALID_TRACKDIR}
 };
 
-const Trackdir _dir_to_diag_trackdir[] = {
+extern const Trackdir _dir_to_diag_trackdir[] = {
 	TRACKDIR_X_NE, TRACKDIR_Y_SE, TRACKDIR_X_SW, TRACKDIR_Y_NW,
 };
 
 
-RailType GetTileRailType(TileIndex tile, Trackdir trackdir)
+RailType GetTileRailType(TileIndex tile, Track track)
 {
 	switch (GetTileType(tile)) {
 		case MP_RAILWAY: