Diesel Santa Fe MARX HO Train Set 74642/1 Missing retailer B Unit

MARX HO was produced during the 1950 & 60's. Allstate is MARX produced exclusively for Sears. This set is retailer not new but in very good condition. Engine has been lubricated and test run and all couplers and wheels are intact. Sets are as I purchased them (used) and some may not be as originally boxed by manufacturer.

A