The Marx 400 locomotive was Marx’s entry level plastic locomotive that it sold in inexpensive electric sets.
Introduced in 1952 as a windup and in an electric version in 1953, the 400 was an 0-4-0 steam locomotive made of plastic. Initially, it supplemented pressed tin engines, although plastic eventually overtook metal in the most inexpensive sets. But in 1953, plastic was still somewhat new and novel. So a set with a plastic engine and tender could actually sell at retail for about 10% more than an all metal set.
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