Fix reservation not cleared from far end of signalled tunnel when removing

src/tunnelbridge_cmd.cpp

@@ -1158,11 +1158,18 @@ static CommandCost DoClearTunnel(TileIndex tile, DoCommandFlag flags)
 			Track track = DiagDirToDiagTrack(dir);
 			Owner owner = GetTileOwner(tile);
 
-			Train *v = nullptr;
-			if (HasTunnelReservation(tile)) {
-				v = GetTrainForReservation(tile, track);
-				if (v != nullptr) FreeTrainTrackReservation(v);
-			}
+			std::vector<Train *> vehicles_affected;
+			auto check_tile = [&](TileIndex t) {
+				if (HasTunnelReservation(t)) {
+					Train *v = GetTrainForReservation(t, track);
+					if (v != nullptr) {
+						FreeTrainTrackReservation(v);
+						vehicles_affected.push_back(v);
+					}
+				}
+			};
+			check_tile(tile);
+			check_tile(endtile);
 
 			if (Company::IsValidID(owner)) {
 				Company::Get(owner)->infrastructure.rail[GetRailType(tile)] -= len * TUNNELBRIDGE_TRACKBIT_FACTOR;
@@ -1184,7 +1191,9 @@ static CommandCost DoClearTunnel(TileIndex tile, DoCommandFlag flags)
 			YapfNotifyTrackLayoutChange(tile,    track);
 			YapfNotifyTrackLayoutChange(endtile, track);
 
-			if (v != nullptr) TryPathReserve(v);
+			for (Train *v : vehicles_affected) {
+				TryPathReserve(v);
+			}
 		} else {
 			/* A full diagonal road tile has two road bits. */
 			UpdateCompanyRoadInfrastructure(GetRoadTypeRoad(tile), GetRoadOwner(tile, RTT_ROAD), -(int)(len * 2 * TUNNELBRIDGE_TRACKBIT_FACTOR));