An RS-20 loco and a cut of gondolas from an ad in the November 27, 1977 Green Bay Press-Gazette.

There were ten gondolas in this class. The cars, built by Thrall Car USA, were 54'-2" long and were numbered #20-29. They are now part of Sault Sainte Marie Bridge Company's (SSAM) car fleet.

Go here to see the full ad.