Thanks for all the replies, guys.
It was the photos of the B&O yard and engine facility that looked odd to me. There were so many of these mixed pairs parked, I was starting to wonder if it was by design.
And, I agree … they look cool. Kinda ornery. Like this Central of New Jersey EMD/ALCO/F-M mixed bag:
I don't know what's going on here. If memory serves me, that is a New Jersey Transit line bridge over the Raritan River. Don't know why there would be an AMTRAK engine, but I don't know about such things. Just a neat photo: