Hello. I need to remove the truck side frame (the underside piece) so I can get to the wheel gears of my GP40's for maintenance and I'm not sure how to do it. It appears that this piece is held on by a tab at the one end but I hesitate to push or pull these pieces too hard for fear of breaking them. Any suggestions? Thx.

Good advice, Thanks!

I own a model train store and I am a dealer for Bachmann. I run 3 trains everyday on my layout, all HO, the Jingle Bell Express, Rail Chief, and McKinley Explorer. I have been running all 3 trains off and on 5 days a week for over a year and I want to replace all the wheels on the rolling stock to get nice new sharp "nibs". Should I use the 36" wheel sets item 42903 or 33" wheel sets item 42904? Thanks.