Hello!
I'm new (again) to model trains, but not scale modeling -- I have an existing love for HO slot cars.

I had a train set as a kid back in the early 90s, fished it out of storage and set it up. As expected, the locomotive didn't run. I disassembled it and as expected, all the grease and oil had congealed and gummed everything up. During cleaning, I noticed that the gears on the geared drive wheels were cracked, allowing the wheels to spin independently of the gears.

So, my questions:

• How do I identify locomotives? I have pictures of below for reference for this one, but I don't want to post every time I need an engine ID. Is there a master list somewhere? I originally thought this might be a GP 40, but after some googling I think it might be an U36. I don't actually know what these model numbers mean, just repeating what I found in my research.
• Are replacement parts available? I see in the Bachmann shop they have listings for Universal HO Geared Drive Wheels. Are those really universal? I assume they're for a subset of locomotives, and probably newer locomotives. I don't know exactly when this one was made, but it's the early 90s. My guess is I probably got this around '93, as the newspaper I used to pack everything up with was dated '95.

Here's the pics, ignore the missing front drive-train and engine. I took pictures after I had already tore it apart for cleaning. It's a standard pancake motor. I saw on youtube that some of these models had a screw in the center of the engine to hold a clip on, it's not that model.




Thanks!