FlyerTalk Forums - View Single Post - Unreserved Keystone service: can you take any train?
Old Jun 21, 2013 | 5:36 am
  #2  
DivMiler
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The only restrictions between Harrisburg (HAR) and Philadelphia (PHL) are
  1. A heavy travel time (such as around Thanksgiving), or
  2. Friday and Sunday "peak" times.

Otherwise I think you are fine to use an unreserved ticket any time before it expires.
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