Atlas 20005860 HO 50ft Single Door Boxcar, NYC(P&E) #4503Atlas 20005860 Master HO 50ft Single Door Boxcar, New York Central (P&E) #4503 Part Number: 843069160816 Description Atlas Master HO Scale 50ft Single Door Boxcar, New York Central (P&E) #4503 Atlas Item #: 20005860 At the end of World War II, railroads ordered large numbers of 50' AAR boxcars with a standard design that was first widely used in the late 1940s. This design was based on the original 1937 AAR design but was modified in the post war era