bobotech......Olsens has a web site with original pages from Lionel's repair manual. Go to Lionel post war then roll down to 2343. Click on the small thumb nail,roll down the parts lists to PDF's of the 2343. There are four or five very helpful drawings of the internals. It looks to me that a gentle cleaning with Dawn dish soap and a soft brush will really help the plastic shell. The front Santa Fe decal is very easy to damage. Just blot it with a soft cloth. Also the red/yellow stripes need to treated the same way. check the brushes and motor comentator (sp?) they are almost always oily and dirty. Use oil lightly.
Richard