The Tyco US1 Trucking Big City Set #3201 was the one that started it all in 1981. It came with two action stations, the unloading yard, and the P.I.E. Freight terminal and trailer. The green dump truck & yellow Peterbilt trucks were included as well. US1 Electric trucking was first featured in the 1981 Montgomery Ward and JCPenny Christmas wish book catalogs as seen below. There was no ad that I am aware of in the Sears Christmas wishbook.

YCO US1 Electric Trucking Big City Set #32010

TYCO US1 Electric Trucking Big City Track Set #3201

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YCO US1 Electric Trucking Big City Instructions

Big City Set Instructions