Definition of "mail car" []

• 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. (noun)

Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)

• "The wheels of ages, the revolution of planets, the flight of comets that spin and dance and wrap their golden trails around sidereal wonders, and carry the news of God from the seat of eternal power to the utmost periphery, bear no greater news in their eternal mail car than the birth of Christ, and the advent of the Son of Mary."