sigc::signal<void, Train &> signal_train_removed;
sigc::signal<void, Block &, Train *> signal_block_reserved;
sigc::signal<void, Sensor &, Sensor::State> signal_sensor_state_changed;
sigc::signal<void, Train &> signal_train_removed;
sigc::signal<void, Block &, Train *> signal_block_reserved;
sigc::signal<void, Sensor &, Sensor::State> signal_sensor_state_changed;