My wife picked this up at Wally World as a joke for my birthday. For $10 you get a an engine (mine doesn't work) tender, two passenger cars, track and signs and electric poles The train is O-gauge and have knuckle couplers that work with vintage Marx plastic knuckles and tab and slot couplers. The passenger cars run great with my Marx locos. I imagine they would work with smaller Lionel as well.
I may go back and get another set so I have four passenger cars for my Christmas train! LOL
Here's a video of the cars being pulled by a Marx 666 and a knuckle coupler tender...