PC: A1-A4 Designations

["Robert Zoellner" <wvs_cs_kid@xxxxxxx>]

Hey!

  Does anyone know what the A1 through A4 designations are for on PC rolling 
stock?
  They are typically toward the right while facing the car.  The only 
correlation I can make is that A2's were 'house' cars and A4's were hoppers.

Wondering in Cincinnati

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