Clocker (train)
Clockers were regular passenger trains between Philadelphia and New York City on the Northeast Corridor; on the Pennsylvania Railroad they left each terminal on the hour until the 1950s and a less-regular schedule continued on Amtrak. The first train run by Amtrak was a Clocker that left Penn Station at 12:05 AM on May 1, 1971. The last Clocker ran on October 28, 2005; to replace them, New Jersey Transit added four express trains between Trenton and New York City at times approximating the Clocker schedule.