MTH Premier 20-93933 O Scale 40' AAR Boxcar Southern Pacific SP #'s Vary Tx Each unit length: 14-1/2"

Each unit length: 14-1/2"

Kato 176-7006 N Scale GE AC4400CW Union Pacific UP 5767

Lower Spring Rates: Soft (Green) = 1

Sawdust - 1

MTH Premier 20-93933 O Scale 40' AAR Boxcar Southern Pacific SP #'s Vary Tx Each unit length: 14-1/2"MTH Premier 20 93933 O Scale 40' AAR Boxcar Southern Pacific SP #'s Vary The 40 steel box car so familiar to model railroaders was a product of the 1930s. Wood box cars, which were built into the World War I era, and early steel cars were largely non standardized, with details varying from railroad to railroad. The move toward standardization began with American Railway Association (ARA) designs of 1923 and 1932. It culminated in the 1937 AAR box car,