The Atlantic City Express was an Amtrak train that ran from Harrisburg, New York City, Richmond, Springfield and Washington, D.C. to Atlantic City, New Jersey, in the Northeastern United States. The train operated on the Northeast Corridor to 30th Street Station in Philadelphia, Pennsylvania, where it went east to Atlantic City.

The Atlantic City Line (ACL) is a commuter rail line operated by NJ Transit (NJT) in the United States between Philadelphia, Pennsylvania and Atlantic City, New Jersey, operating along the corridor of the White Horse Pike. It runs over trackage that was controlled by both the Pennsylvania Railroad (PRR) and the Pennsylvania-Reading Seashore Lines. It shares trackage with SEPTA and Amtrak on the Northeast Corridor (NEC) until it crosses the Delaware River on Conrails Delair Bridge into New Jersey.