Don, those dollhouses were something. I recall my sister having one in the fifties. Seems like they could work with G-scale or standard gauge, but sure would look silly with our trains, you're right. Marx must have made a huge variety of styles, as I remember seeing lots of them in the Marx Toy and Train Museum in Wheeling, WV.
Here are three more tin cabooses (yes, cabooses) . First, a scale Reading, maybe a little less common than the NYC, at least it seemed like it when I was looking for one.. Second photo is the common 7" series AT&SF. Last, a new Marx NYC, based on the 7" cars.