I wish I could have taken a picture.
It's not uncommon for the MBTA (Boston commuter rail) to hook up a GP to a train when they're having trouble with an engine out on a run.
I never saw matching F40PH-s until yesterday. I think it was 1063 and 1011.
Too bad they were both facing front. It would have been awesome if they were in classic A-A formation.
--Joe