+ if(!advancing && vehicles.front()->is_placed())
+ {
+ TrackIter track = last_entry_block.track_iter();
+ if(reverse)
+ {
+ track = track.flip();
+ vehicles.back()->place(track, VehiclePlacement::BACK_AXLE);
+ }
+ else
+ vehicles.front()->place(track, VehiclePlacement::FRONT_AXLE);
+ }
+ }
+ else if(BeamGate *gate = dynamic_cast<BeamGate *>(&sensor))
+ {
+ if(!advancing && vehicles.front()->is_placed())
+ {
+ TrackIter track = allocator.iter_for(*block).track_iter();
+ for(; (track && &track->get_block()==block); track=track.next())
+ if(track.track()==gate->get_track())