diff -r b00756560b9d -r e19fda04e8d3 src/ai/trolly/trolly.cpp
--- a/src/ai/trolly/trolly.cpp	Sun Jul 29 23:25:17 2007 +0000
+++ b/src/ai/trolly/trolly.cpp	Sun Jul 29 23:42:59 2007 +0000
@@ -800,7 +800,7 @@
 		for (j = DIAGDIR_BEGIN; j < DIAGDIR_END; j++) {
 			TileIndex t = tile + TileOffsByDiagDir(j);
 
-			if (IsTileType(t, MP_STREET) &&
+			if (IsTileType(t, MP_ROAD) &&
 					GetRoadTileType(t) == ROAD_TILE_DEPOT &&
 					IsTileOwner(t, _current_player) &&
 					GetRoadDepotDirection(t) == ReverseDiagDir(j)) {
@@ -1101,7 +1101,7 @@
 	CommandCost res;
 	assert(p->ainew.state == AI_STATE_BUILD_DEPOT);
 
-	if (IsTileType(p->ainew.depot_tile, MP_STREET) && GetRoadTileType(p->ainew.depot_tile) == ROAD_TILE_DEPOT) {
+	if (IsTileType(p->ainew.depot_tile, MP_ROAD) && GetRoadTileType(p->ainew.depot_tile) == ROAD_TILE_DEPOT) {
 		if (IsTileOwner(p->ainew.depot_tile, _current_player)) {
 			// The depot is already built
 			p->ainew.state = AI_STATE_BUILD_VEHICLE;