RI 6858-6899
RI 6858-6899 (to ROCK 506858-506899)
These 50-ton, 50'-6" double-door box cars were built by ACFI in 1960. They featured a 15'-0" door opening, daigonal panel roof, Dreadnaught ends, Evans DF belt rails, Ajax hand brakes, Ride Control trucks and 4862 ft3 capacity.