Fix tunnel exit signal not being set to red when train exited

src/train_cmd.cpp

@@ -5515,6 +5515,10 @@ bool TrainController(Train *v, Vehicle *nomove, bool reverse)
 				if (update_signal_tunbridge_exit) {
 					UpdateSignalsOnSegment(gp.new_tile, INVALID_DIAGDIR, v->owner);
 					update_signal_tunbridge_exit = false;
+					if (v->IsFrontEngine() && IsTunnelBridgeSignalSimulationExit(gp.new_tile)) {
+						SetTunnelBridgeExitSignalState(gp.new_tile, SIGNAL_STATE_RED);
+						MarkTileDirtyByTile(gp.new_tile, VMDF_NOT_MAP_MODE);
+					}
 				}
 				continue;
 			}