AAR type A switcher truck
- AAR type A 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 US 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 feet (2,438.4 mm).
See also
* Truck
* Blomberg B
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