Just like its double door counterpart, the 40’ 1937 AAR Single Door Box Car is well constructed with high quality craftsmanship. Featuring accurate painting and lettering, this 40’ 1937 AAR Single Door Box Car captures the history and nostalgia of the real life model with great detail. Features Include: Wire grab irons Die-cast ladders Weighted chassis Etched metal roofwalk Bettendorf trucks Prototypical painting and lettering Scale 33" wheels (2-rail) Minimum diameter curve: O-36 (3-rail) Minimum radius curve: 24" (2-rail) Please note: Atlas "O" scale couplers can also be used on both 2-rail and 3-rail versions. Four road numbers are available per road name except for Bessemer & Lake Erie and Nickel Plate, which have two. One number is available per road name for the Special 2-Pack.