scalp ticketn. originally U.S. a ticket sold by a scalper (see scalpern.2 2a).
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commutation ticket1848
scalp ticket1880
parliamentary ticket1893
contract1899
awayday1972
1880 G. A. SalaAmer. Revisited 201/1 There are ‘round trip’ tickets which are something more than return, tickets; and finally, there are ‘scalp’ tickets, which you can deal in and discount.
1941 S. J. BakerPop. Dict. Austral. Slang 68Scalp ticket, the return half of a train ticket.