Stacy, Lionel did make an Atlantic, a small 6 coupled steam locomotive and a GP something in large scale. The Atlantic was rather chunky and the one I bought wouldn’t run at all. Its wheels weren’t true on the axles. The diesel they made was a bit small, I think it was 1:32nd. I haven’t heard much about it, so I guess not many were made.
Lionel also did some Thomas in large scale, and from what I have read about them, they were problematic.
It would be nice if Lionel would get back into large scale with some quality stuff, better then what they had. I have a few Lionel cars in large scale, and they aren’t particularly well detailed, and they aren’t top of the line quality wise. But since I gottem cheap, they are good for bashing and detailing.