It always amazed me how Marx could take a handful of their pretty extensive line of trains and place them in something like ohhh a million different train sets :-) Yeah, it seems like they had that many sometimes and you'll see the same stuff popping up in many different sets with a multitude of different track configurations and accessories. Lionel on the other hand was one of the forerunner's of the 'limited edition' nonsense we as consumers have had to deal with over the past several decades. 'L' was always coming out with new items and retiring the old. It seemed like Marx never almost never retired the old which was good thing because developing an extensive line of toys and repackaging them in different configurations over the course of decades kept prices low.
I don't actually have a lot of set. I decided early on to concentrate on the plastic accessories and just buy mostly loose pieces of engines and rolling stock as whim dictated. So here at least is a set sold by Montgomery Wards, one of the early catalog mail-order giants. Enjoy! Opa Fritz and Oma Bettina