void release_blocks_begin(const BlockList::iterator &);
void release_blocks_end(const BlockList::iterator &);
void release_block(const BlockList::iterator &);
void release_blocks_begin(const BlockList::iterator &);
void release_blocks_end(const BlockList::iterator &);
void release_block(const BlockList::iterator &);
void turnout_path_changed(Track &);
void block_reserved(Block &, const Train *);
void sensor_state_changed(Sensor &, Sensor::State);
void turnout_path_changed(Track &);
void block_reserved(Block &, const Train *);
void sensor_state_changed(Sensor &, Sensor::State);