"Subway tokens" refers to small, round pieces of metal or plastic that were used as a form of payment to ride on a subway train or subway system. Full definition
Aside from some tangential discussion about rat fertility and a perceived paucity of subway token booth clerks, conversation during the hearing frequently turned to the capital plan, and just how the M.T.A. hopes to fill the hole. (politico.com)
While some coins will be classified as securities, others may be looked at as subway tokens that grant owners access to a network. (cryptoninjas.net)