AAR type A switcher truck

SW-1000 with switcher trucks

Side profile of the AAR type switcher truck.

The AAR type A switcher truck is a diesel locomotive truck introduced by EMD and installed as standard equipment on most EMD switcher locomotives and on those of other manufacturers. It was designed by Martin P Blomberg and its US Patent was filed on Jul 6, 1937 and approved Nov 15, 1938 under U.S. Patent 2,137,074. It was designed for switcher service where the more complex high-speed passenger locomotive trucks were not needed. The truck uses drop equalizers but does not have swing hangers as used on the Blomberg B and others. A combination of coil springs, and leaf springs, positioned fore-and-aft inside the drop equalizers, give a good balance of damping. The wheelbase is 8 ft 0 in (2,438 mm).

Locomotive running and valve gear

Valve gear types	Allan Baker Bagnall-Price Baguley Bulleid Caprotti Gab Gooch Gresley Hackworth Joy Kuhn slide Lentz Southern Stephenson Walschaerts

Bogie types	AAR type A switcher truck Articulated bogie Bissel truck Blomberg B Grovers bogie Jacobs bogie Krauss-Helmholtz bogie Pony truck Radial steering truck Schwartzkopff-Eckhardt II bogie

Other running gear elements	Adams axle Axlebox Beugniot lever Carrying wheel Coupled wheel Driving wheel Equalising beam Gölsdorf axle Journal box Klien-Lindner axle Leading wheel Luttermöller axle Radial axle Railway tire Trailing wheel Train wheel

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AAR type A switcher truck

See also