I think that had WWII not interupted OO production, Lionel would have cloned the Scale Craft car as they did with the rolling stock, I kn6ow Lionel had prototypes of 2 rail track switches that never made it into production. I am sure they had other things in OO planned. But a world war combined with what was probably a quick fall off in OO scales as HO took off just before the war, put an end to that project. I believe a sharp rise in cost to produce the 700e has been quoted as the reason it and the B6 did not return after the war. Mike the Aspie