Only one repair guide for prewar AFAIK: Greenberg's, Repair & Operating Manual Prewar Lionel Trains. By John G. Hubbard. You can go to bookfinder.com, eBay, Amazon, Google, to find it, as well as several guides. Some are quite pricey. The LCCA has included John Holtmann's HSL Inc. Digital Publications. Inc. all Lionel catalogs 1900- 2006, postwar repair manual and several other related publications. For 25.00 per year. Good luck.
Chris