39871, 39884, 39902
Built by ACF® from 1940-1953, the 70-Ton Hart Ballast Cars were formally known as “Hart Selective Service Ballast Cars”, due to the use of specially-designed doors which allowed the lading to be discharged one of three ways: to the center of the rails, to the center and sides of the rails, or to the side of the rails only.
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