If extra sections of a timetabled train are being run, then the first train and all extra section except the last should be displaying green flags on the lead locomotive.
A little over 10 years ago it wasn't uncommon for trains to appear out of no where and the question would arise.. What train was that?? Bottom line being that Amtrak would run extra sections of a train. So for instance train 1234 would leave DC at 12pm and was full so Amtrak would run a second train 1234 10 minutes behind it. These days, Amtrak runs longer trains rather then extra sections. I'll guess that has to do with crew availability.. Either way you still see Commuter Equipment on Sundays.
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Edited by chakk, 20 November 2017 - 07:32 PM.