Allow value of "PBS entry signal" conditional to be a rail depot.

src/pathfinder/yapf/yapf_costrail.hpp

@@ -221,10 +221,14 @@ private:
 				TileIndex tile = v->tile;
 				Trackdir  trackdir = v->GetVehicleTrackdir();
 
-				CFollowTrackRail ft(v);
-
 				TileIndex candidate_tile = INVALID_TILE;
 
+				if (IsRailDepotTile(v->tile)) {
+					candidate_tile = v->tile;
+				}
+
+				CFollowTrackRail ft(v);
+
 				for (;;) {
 					if (IsTileType(tile, MP_RAILWAY) && HasSignalOnTrackdir(tile, trackdir)) {
 						if (HasPbsSignalOnTrackdir(tile, trackdir)) {

src/pbs.cpp

@@ -409,6 +409,10 @@ Train *GetTrainForReservation(TileIndex tile, Track track)
  */
 TileIndex VehiclePosTraceRestrictPreviousSignalCallback(const Train *v, const void *)
 {
+	if (IsRailDepotTile(v->tile)) {
+		return v->tile;
+	}
+
 	// scan forwards from vehicle position, for the case that train is waiting at/approaching PBS signal
 
 	TileIndex tile = v->tile;

src/tracerestrict_gui.cpp

@@ -1413,6 +1413,14 @@ public:
 		TraceRestrictItem item = GetSelected();
 		if (GetTraceRestrictTypeProperties(item).value_type != TRVT_TILE_INDEX) return;
 
+		if (!IsTileOwner(tile, _local_company)) {
+			ShowErrorMessage(error_message, STR_ERROR_AREA_IS_OWNED_BY_ANOTHER, WL_INFO);
+			return;
+		}
+
+		if (IsRailDepotTile(tile)) {
+			// OK
+		} else {
 			if (!IsPlainRailTile(tile)) {
 				ShowErrorMessage(error_message, STR_ERROR_THERE_IS_NO_RAILROAD_TRACK, WL_INFO);
 				return;
@@ -1422,10 +1430,6 @@ public:
 				ShowErrorMessage(error_message, STR_ERROR_THERE_ARE_NO_SIGNALS, WL_INFO);
 				return;
 			}
-
-		if (!IsTileOwner(tile, _local_company)) {
-			ShowErrorMessage(error_message, STR_ERROR_AREA_IS_OWNED_BY_ANOTHER, WL_INFO);
-			return;
 		}
 
 		TraceRestrictDoCommandP(this->tile, this->track, TRDCT_MODIFY_DUAL_ITEM, this->selected_instruction - 1, tile, STR_TRACE_RESTRICT_ERROR_CAN_T_MODIFY_ITEM);