The AAR wheel arrangement system is a method of classifying locomotive (or unit) wheel arrangements that was developed by the Association of American Railroads. It is essentially a simplification of the European UIC classification, and it is widely used in North America to describe diesel and electric locomotives. It is not used for steam locomotives. This system counts axles instead of wheels. Letters refer to powered axles, and numbers to unpowered (or idler) axles. “A” refers to one powered axle, “B” to two powered axles in a row, “C” to three powered axles in a row, and “D” to four powered axles in a row. “1″ refers to one idler axle, and “2″ to two idler axles in a row. A dash (”–”) separates trucks, or wheel assemblies. A plus sign (”+”) refers to articulation. Here are several examples of AAR notation that will help in determining the size and configuration of model railroading locomotives and model train rolling stock:
- 1A-A1 -> means there are two identical trucks, or wheel assemblies under the unit. Each truck has one powered axle, and one idler axle, with the idler axles to the outside. Examples include Budd RDC Diesel MU (DMU) cars.
- 1D ->means there are two trucks, or wheel assemblies. The “1″ truck is under the front of the unit, and has one idler axles. The remaining 4 axles are rigidly mounted to the frame behind this lead truck . The only known examples are a series of diesel locomotives built and owned by the Texas-Mexican Railway.
- 2-A1A -> means there are two trucks, or wheel assemblies. The “2″ truck is under the front of the unit, and has two idler axles in a row. The “A1A” truck is under the rear of the unit, and has one powered axle, one idler axle, and one more powered axle. An example is the FM OP800 800 hp (600 kW) railcar, six of which were built by the St. Louis Car Company exclusively for the Southern Railway in 1939.
- 2-B
- 3-A1A
- A1A-2
- A1A-3
- A1A-A1A
- A1A-B+B
- B
- B-1
- B-2
- B-A1A
- B-B
- B-2-B
- B-B-B
- B+B+B
- 2-B+B-2
- 2-B+B+B+B-2
- B+B-B+B
- B-B-B-B
- B-B+B-B+B-B
- C
- C-B
- C-C
- 1-C+C-1
- 2-C+C-2
- 2+C-C+2
- 2-C1+2-C1-B
- C-C+C-C
- C+C-C+C
- 1-D-1
- 2-D-2
- D-D
- 2-D+D-2
- B-D+D-B
- 1B+D+D+B1
- (B+B-B+B)+(B+B-B+B)
That’s all for now, and Happy Railroading!
