 The "Metropolitan Special" carried vast amounts of mail and express packages in many (often 10+) baggage cars and express cars, and the train served various smaller towns and villages that were bypassed by the more prestigious trains along the route, the "National Limited" and the "Diplomat".Added revenue for the train came from Railway Post Office cars, which sorted and canceled mail en route, between terminals.By 1948 the "Washington Night Special" picked up the initial Jersey City to Baltimore part of the route.