unsigned get_path() const { return path; }
bool is_dead_end() const { return dead_end; }
void check_link(TrackPart &);
TrackPart *get_link(unsigned) const;
unsigned get_path() const { return path; }
bool is_dead_end() const { return dead_end; }
void check_link(TrackPart &);
TrackPart *get_link(unsigned) const;