Commutation ticket
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A railroad ticket giving the holder the right to travel at a certnin rate for a limited number of trips (or for an, unlimited number within a certain period of time) for a less amount than would be pnid in the aggregate for so many separate trips.
Interstate Commerce Com'n v. Baltimore & O. B. Co.. (C. C.) 43 Fed. 56.