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[Ham549]

I know about the F40PH but what is a F40PHR?

[CSSHEGEWISCH]

F40PHR is an informal designation for the Amtrak F40PH's that were built with SDP40F's as trade-in credit.  Some of them had a number of one of the trade-ins under the cab window, probably for accounting purposes.

[DMUinCT]

Also you have the F40PHL (long) that have a second independent diesel for HEP (head end power) to allow a slow idle with the prime mover during long waits between runs while keeping the coaches warm and lighted.