static Route *find(const TrackIter &, Track &);
static Route *find(const TrackIter &, const Route &);
static Route *find(const TrackIter &, const Zone &);
static Route *find(const TrackIter &, Track &);
static Route *find(const TrackIter &, const Route &);
static Route *find(const TrackIter &, const Zone &);