Road & Rail Set No. 3235 was sold between 1981-1985. Two #3727 B-5837 tracks are included in this set and are highly sought after. The set itself has no other rare items included. You can also add any Tyco HO train set to a US-1 Trucking set by purchasing two of the #3227 Tracks and a Tyco Train Set. See the video below for an example.

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1990s set with Tyco Railroad. From Eric Werner