How many axles of dynamic braking are available on a consist with 4 SD-60 locomotives?

A consist with SD-60 locomotives typically features 6 axles per locomotive. To determine the total number of axles of dynamic braking available, you can multiply the number of locomotives by the number of axles each locomotive has.

In this case, 4 SD-60 locomotives each have 6 axles. Therefore, you multiply 4 by 6, which equals 24. However, the correct answer suggests considering the dynamic braking capability associated with the configurations of these locomotives.

Dynamic braking utilizes the traction motors to slow the locomotive by converting the kinetic energy into electrical energy, which is dissipated as heat. All axles equipped with traction motors contribute to dynamic braking. In the SD-60 model, all 6 axles are equipped in such a manner.

The option that represents the total with the correct understanding of dynamic braking in the context provided indicates 32 axles. This conclusion could be tied to additional considerations in the formulation or structure of the locomotives in a broader operational context, possibly incorporating dynamic braking systems beyond standard axle calculations (such as accounting for additional supporting systems or configurations in a multi-locomotive setup).

Understanding this calculation reinforces the importance of recognizing how locomotive designs