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Canadian Pacific
1929 Minibox
In 1929 and 1930, 7500 fifty ton steel box cars of a new design were built for the Canadian Pacific Railway. This was the first large group of steel box cars to be built and operated in Canada
The distinctive features of the design, the low interior height of 8’7”, the Murphy radial all steel roof, and Dreadnaught ends with recessed corrugations, made the cars stand out in Canadian freight trains for more than forty years. Their small size earned them the title “minibox” form modelers.
BACKGROUND
In 023, the American Railroad Association (ARA) developed standard dimensions for a steel box car. The recommended dimensions were 40’6” inside length and 8’7” inside height. The ARA design was used by a number of northeastern US railroads, including the PRR, NYC, B&O, CNJ, LV, DL&W and Reading for double sheathed steel box cars. The PRR built about 30,000 cars of their class X-29, while others built a total of about 20,000.
1925 ARA design for a double sheathed box car included vendor options such as Dreadnaught ends (Recessed) and a Murphy steel radial roof. The ATSF built their BX-9 class following this design. The CPR, an important member of the ARA, innovatively advanced the design of steel box cars within the dimensions of the 1925 car for their first major steel box car order. The ARA followed their lead on an enlarged car for the 1932 design.
A prototype for the “minibox” was built by the CPR’s Angus Shops in Montreal in June 1927. This car # 180000 was somewhat different than the subsequent production having steel sides that overhung the side sills and a flat steel door. It remained in service until at least 1937, but was retired by 1940.
The main dimensions of the production cars: inside length 40’6”; interior height 8’7”; height of running 13’ 2”; interior width 8’7”; door opening 5’0”; capacity 120,000 lbs. and300 cubic feet.
John Riddell
dgs