sigc::signal<void, unsigned, bool> signal_function_changed;
sigc::signal<void, TrainAI &, const TrainAI::Message &> signal_ai_event;
sigc::signal<void, Block &> signal_advanced;
+ sigc::signal<void, Block &> signal_rear_advanced;
sigc::signal<void, unsigned, Vehicle &> signal_vehicle_added;
sigc::signal<void, unsigned, Vehicle &> signal_vehicle_removed;