There is a "garbage can" under the fireman's side of the engine. What is the purpose of this? It is attached to the frame by a Phillips head screw. Something that other railroads applied to their engines and Lionel simply did their generic thing?
I have been making some modifications to this loco: headlight/backup light visors from styrene, removing the aforementioned "garbage can" and adding PSC blowdown mufflers, painting all the white sidewalls and running board edges black, and will add an air ringer bell.
I'd like to remove the injector piping, but that means a lot of grinding on the firebox. Probably won't do it.
Too bad Lionel didn't put the engine marker lights in the correct position on the sides of the smokebox; the train indicators are in the correct place for SP, and the catalog specifically mentioned that aspect. Long before the engine went into production I sent Lionel a photo of the 2521 that's on display in Yuma, AZ. Not that difficult to have the correct boiler front and headlight/backup light. Lionel put the correct boiler front/headlight on the PM Berkshire. The smokebox and firebox should be painted a graphite and oil color; aluminum paint would simply burn off due heat; the aluminum paint on the display engine is purely cosmetic.