Editing Clocker (train) (section)

=== Pennsylvania Railroad ===
The ''Clocker'' was originally a [[Pennsylvania Railroad]] express train service between New York and [[Broad Street Station (Philadelphia)|Broad Street Station]] in Philadelphia;<ref name="trains">{{cite journal|last=Rung, Jr.|first=A. M.|date=January 1948|title=Philly's personality trains|journal=Trains}}; 15</ref> the name was unofficial, and PRR timetables did not use it. Soon after [[Pennsylvania Station (New York City)|New York Penn Station]] opened in 1910, the express trains began departing New York and Philadelphia [[wiktionary: on the hour|on the hour]] through the day, giving rise to the Clocker name (which the railroad itself seems never to have used). Until the [[railway electrification system|electrification]] of the Northeast Corridor in 1933, most ''Clockers'' were scheduled to both leave and arrive on each hour, but faster schedules after electrification eliminated the on the hour arrival.

Pennsylvania Railroad cut back on the schedule, and by the time Amtrak took over the nation's passenger rail service on May&nbsp;1, 1971, the ''Clocker'' service no longer ran hourly.