2-8-4 Berkshire - Loco Store

The development of the 2-8-4 wheel arrangement for steam locomotives was a result of an effort by the Lima Locomotive Works to improve on the speed and horse power of the USRA Mikado (2-8-2) locomotive, which was designed by the United States Railroad Administration during World War I. The USRA design had difficulty keeping up steam over long periods and often experienced wheel slippage.

After its debut in 1925, the "Berkshire" type locomotive continued to be improved by locomotive builders and the various railroads that used them. These heavy-duty main line locomotives were used by many railroads. Notably among them were the Boston & Albany Railroad, the Chesapeake & Ohio, the Erie Railroad, the Illinois Central Railroad, the Nickel Plate Road and the Pere Marquette Railroad.

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