The "wheels" on a diesel locomotive, are arranged in pairs of axles connected to
Diesel Locomotive Axle

A wheel set or power axle. (Notice the gear piece.)

gether by frames known as trucks, bogies, or simply "axles".

They can be arranged in several different ways, can can also be powered mechanically by levers and gears to make the locomotive move, or powered electrically by AC or DC currents.

The wheels of a diesel locomotive often share or have gears, levers, or rods which connect to the brakes and engine, which makes the actual locomotive move.
EMD SD70 Trucks

An example of EMD SD70 Series "hi-aid" heavy suspension trucks.


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