mail car n. A railway car of special design used for the transportation and sorting of mail en route to its destination, and having employees of the post office inside to perform those functions.
... replied, 'it is too bad you did not let me know a little sooner, for the mail car is gone; it starts at ... — Bidwell's Travels, from Wall Street to London Prison - Fifteen Years in Solitude • Austin Biron Bidwell
...
