Among the first standard boxcar designs adopted by American railroads, the WalthersMainline 1937 40' AAR Modified Boxcar features:
- Limited edition - one time run of these roadnumbers 1000s used in general service late 1930s to 1980s
- Based on taller cars built with 10' 6" interior height featuring:
- 5-5 Dreadnaught ends
- Murphy panel roof
- Wood running board
- 6' Youngstown doors
- AAR (tab) side sills
- Correct 33" turned-metal wheelsets
- Proto MAX(TM) metal knuckle couplers