Examples
- (A1A)(A1A)
- Two bogies or wheel assemblies under the unit. Each bogie has one powered axle, one idle axle, and one more powered axle, to provide better load distribution and reduce the wheel load on the track. All powered axles are individually driven by traction motors.
- BB
- Four powered axles all mounted in the locomotive's frame, driven in pairs; i.e. each pair of axles is connected by driving rods or gears. Compare with "D" below.
- B′B′
- Two bogies or wheel assemblies under the unit. Each truck has two powered axles, connected by driving rods or gears. Three-quarters of all modern locomotives (as well as the power cars of self-propelled trains) are configured in either this or the "Bo′-Bo′" arrangement.
- Bo′(A1A)
- Two trucks or wheel assemblies. The "Bo′" truck is under one end of the unit, and has two powered axles, while the "(A1A)" truck under the other end of the unit has one powered axle, one idle axle, and another powered axle. All powered axles are individually driven by traction motors.
- Bo′Bo′
- Two bogies or wheel assemblies under the unit. Each truck has two powered axles individually driven by traction motors. Three-quarters of all modern locomotives (as well as the power cars of self-propelled trains) are configured in either this or the "B′B′" arrangement. Many types of tram use this arrangement. See also: Bo-Bo.
- Bo′Bo′Bo′
- Three bogies or wheel assemblies under the unit. Each truck has two powered axles individually driven by traction motors. See also: Bo-Bo-Bo.
- C
- Three powered axles, connected by driving rods or gears, all mounted in the locomotive's frame (Whyte notation: 0-6-0).
- C′C′
- Two bogies or wheel assemblies under the unit. Each truck has three powered axles, connected by driving rods or gears.
- Co′Co′
- Two bogies or wheel assemblies under the unit. Each truck has three powered axles individually driven by traction motors. See also: Co-Co.
- 2Co′Co2′
- A locomotive with two bogies. These have two leading axles and three individually powered axles. A number of Japanese electric locomotives used this wheel arrangement, including the JNR Class EF58 as well as the PRR GG1.
- D
- Four powered axles, connected by driving rods or gears, all mounted in the locomotive's frame (Whyte notation: 0-8-0).
- 1′D1′
- One leading idle (non-driven) axle mounted in a bogie, four driven axles mounted in the frame and connected by driving rods or gears, followed one trailing idle axle mounted in a bogie (Whyte notation: 2-8-2).
- E
- Five powered axles, mounted in the locomotive's frame (Whyte notation: 0-10-0).
- 2′D1′h3S
- Two front leading axles grouped in a bogie, four driving axles, one trailing axle in a bogie, simple steam expansion, superheated steam, three-cylinders, for fast trains.
- 1′E1′h2Gt
- One front leading axle in a bogie, five driving axles, one rear trailing axle, simple steam expansion, superheated steam, two-cylinder machine, for freight trains, tank engine.
- 1′Dn4vP
- One front leading axle in a bogie, four driving axles, saturated steam, four-cylinder machine, compound (double steam expansion), for passenger trains.
- D′Dh4vtG
- No front leading axle, four driving axles in a bogie, four more driven axles mounted in the frame (Mallet locomotive), superheated steam, four-cylinder machine, compound (double steam expansion), tank locomotive, for freight trains.
Read more about this topic: UIC Classification Of Locomotive Axle Arrangements
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