>>Behind the tenders is a backup diesel, just in case
I'm not a dedicated 'railfan', but I've read that it's there to provide air pressure for the brakes. It's a bit of a puzzle for me as the switch from steam to air brakes (Westinghouse) came before 1941, so that shouldn't be necessary.
Any actual railfans (or railroaders) care to set me straight? I've a neighbor up on the lake who's retired from repairing RR engines. I'd ask him, but the lake's frozen and no plans to go until ice out.
All that said, this was a beautiful illustration of using Google Earth and Street View to plan a shoot. I've used it for preliminary scouting - and then PhotoPills to figure out when I'll get the light I want. The weather's still kind of a crapshoot, but it's worth checking out ClearOutside (website plus mobile apps) for a low/mid/high clouds report. In my experience, lots of highs alone mean a good sunrise/set is coming. CO is mostly for astronomers (should I even bother with the telescope?) but is useful for landscape photog as well.