Editing Clocker (train) (section)

{{Short description|Former passenger train service}}
{{Use mdy dates|date=March 2021}}
{{italic title}}
{{Infobox rail service
| box_width   = 300px
| name        = ''Clocker''
| image       = AMTK 923 leaving 30th StxRP.jpg
| image_width = 300px
| caption     = A [[GG1]] pulling a ''Clocker'' departing [[Philadelphia]] in 1976
| type        = [[Inter-city rail]]
| status      = Discontinued
| locale      = [[Northeast Corridor]]
| predecessor = 
| first       = 1910s
| last        = October 28, 2005
| successor   = [[NJ Transit Rail Operations|NJ Transit]]
| operator    = 
| formeroperator = [[Pennsylvania Railroad]], [[Amtrak]]
| ridership   = 
| start       = {{amtk|Philadelphia}}
| stops       = 
| end         = {{amtk|New York}}
| distance    = {{convert|91|mi|km}}
| journeytime = 95–110 minutes
| frequency   = Multiple weekday round-trips
| trainnumber = 
| class       = Unreserved coach
| stock       = [[Amfleet]] coaches
| gauge       = {{railgauge|ussg}}
| el          = Overhead catenary 
| speed       = 
| owners      = [[Amtrak]]
| routenumber =
| map         = {{Clocker}}
| map_state   = 
}}

The '''''Clocker''''' was a passenger train service between [[Philadelphia]] and [[New York City]] on the [[Northeast Corridor]] at first by the [[Pennsylvania Railroad]] and later by [[Amtrak]]. The service was nicknamed the ''Clocker'' by riders as trains were scheduled to leave each terminal at the top of the hour. The name was eventually adopted into official use by Amtrak in 1981. The service was briefly renamed '''''Acela Commuter''''' in 1999 before the name reverted to ''Clocker'' in 2003. 

Amtrak discontinued the service on October&nbsp;28, 2005, and it was partially replaced by additional [[NJ Transit Rail Operations|NJ Transit]] express trains between [[Trenton, New Jersey]], and [[New York City]] at times approximating the ''Clocker'' schedule.