I recently found my Lionel train set Dad gave me in the mid-1950's. I thought I'd try to get it to run again, but need some details as to what I've got (and find a few parts that seem to be lost). I thought it was HO gauge, but don't know. The engine is 2-6-4, has "2035" printed on the engineer's cab and is 10.5" Long X 3/5" High X 2.25" Wide. I found a 2035 engine on Ebay, but the ad didn't say whether it was O gauge or HO gauge. The track has 3-rails and the control transformer has "Type 1033" on the label. Ebay also had a 2-rail switch in an HO box, so I thought perhaps the 3-rail track was O gauge rather than HO. Any guesses as to what I have??? Lionel says they don't have a research group so can't say.
My brother (8 years younger) has a smaller size American Flyer that has a 2-rail track. We don't know what gauge that one is either. Any guesses on his?