Hello Kevin, your post helps al lot. I guess the 45 tonner is easier to deal with.
Your name sounds familiar to me, since I am a subscriber to "Garden Railways".
Thanks again
Peter

I want to turn my Spectrum Mogul and GE 45 ton engines to DCC, using ESU LokSound decoders and appropriate speakers. I´m looking for useful disassembly hints. 

Greetings from Germany
Peter