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. FEATURES INCLUDE: - Die-cast chassis - Ready-to-run - NEW! 70-ton friction-bearing trucks - Separately-applied side-dump doors which can be positioned open or closed - Separately-applied grab irons, coupler cut lever, train line hose, and air brake piping detail - Fully detailed interior, including cross-bracing and side stiffeners -AccuMate Proto-Coupler ready (coupler boxes for Proto-coupler will be included in the packaging) - Accurate painting and printing