HO Scale - ACF 4650 3-Bay Hopper - Burlington Northern #446274Description: production of the 4650 cubic foot 3 bay cars began in 1964. ACF built 2504 examples at Huntington, WV, between 1964 and 1972. The ACF 4650 c. f. 3 bay hopper was the same height and width as the 5250 c. f. 4 bay car but several feet shorter in length (and only had 3 bays!). Some railroads that were not concerned about having the larger plate C clearance 4650cf cars (which could not be used on all branchlines or at all loading facilities)