Lionel made 3-rail roadbed track for their OO gauge line pre-war. It wasn't very successful, the biggest issue being that the bakelite plastic roadbed had a tendency to warp along the length. As far as I'm aware Marx's roadbed track was the first of its kind in O gauge. From memory, it started in 1961 as an exclusive to sets sold at Sears and was only made in 0-27, and never in Marx's 0-34. I'm sure some Marx collectors on here can give you more details.
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