Eastbound #3 Track, at GLEN Tower. Shown here is PRR engine #6464, J-1 (S/N 4413) 2-10-4 "Texas" built in Juniata in
January of '43 and retired in September of '57 after only 14 years service.
Used mostly for hauling ballast to and from worksites. Also used for "stone trains". In the autumn, when the leaves come tumbling down, they come down on tracks. too. The pile up of leaves makes the tracks slippery (dangerous). We'd send out consists of a bunch of stone cars and engines to just "polish the rails". The weight and heat crushed and burned off the goo from the leaves.
Amtrak is (was?) using a Swedish designed "motor", an electric engine, that they nicknamed Meatballs. I don't remember much more of them than that. It is (was?) very common on Amtrak customer revenue trains.