Fix limit train lookahead to signal aspect within signalled tunnel/bridges

src/pbs.cpp

@@ -999,6 +999,7 @@ void SetTrainReservationLookaheadEnd(Train *v)
 	int32 threshold = v->lookahead->current_position + 24;
 	uint8 known_signals_ahead = 1;
 	for (const TrainReservationLookAheadItem &item : v->lookahead->items) {
+		if (item.end >= v->lookahead->reservation_end_position) break;
 		if (item.type == TRLIT_SIGNAL) {
 			if (item.start <= threshold) {
 				/* Signal is within visual range */

src/train_cmd.cpp

@@ -4083,6 +4083,7 @@ static TileIndex CheckLongReservePbsTunnelBridgeOnTrackdir(Train* v, TileIndex t
 			} else {
 				raw_free_tiles = GetAvailableFreeTilesInSignalledTunnelBridgeWithStartOffset(tile, end, v->lookahead->tunnel_bridge_reserved_tiles + 1);
 				ApplyAvailableFreeTunnelBridgeTiles(v->lookahead.get(), raw_free_tiles, tile, end);
+				SetTrainReservationLookaheadEnd(v);
 			}
 		} else {
 			raw_free_tiles = GetAvailableFreeTilesInSignalledTunnelBridge(tile, end, tile);