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Express (adjective) is spelled the same in French (ex/ un train express > an express train). To express (verb) is 'exprimer'.
Mail means the train which carries the post letters. Express train which not.
mail train always has right of way express train has limited stops passenger train carries people
an express train - luastraein, an express bus - luasbhus (m4)
Atlantic City Express - Amtrak train - was created in 1989.