Diesel Mechanics

Diesel locomotives became the dominant type of locomotive in rail transport in the mid 20th century in much of the world. Powered by diesel engines, they use a variety of transmissions to convey power to the wheels.

 Diesel locomotives, in contrast to electric locomotives, do not require catenary installations to run. Therefore, they offer more flexibility in various types of service and are generally predominant in countries which, for historical or economical reasons, have few electrified lines. Since the 1950s, however,they have been superseded by electric locomotives in terms of power, maximum speed,tractive effort, and acceleration.

diesel-hydraulic locomotives use hydraulic transmission to convey the power from the diesel engine to the wheels. On this type of locomotive, the power is transmitted to the wheels by means of a device called a torque converter. A torque converter consists of three main parts, two of which rotate, and one which is fixed. All three main parts are sealed in a housing filled with oil. 

The inner rotating part of a torque converter is called a centrifugal pump (or impeller), the outer part is called a turbine wheel (or driven wheel), and between them is a fixed guide wheel. All of these parts have specially shaped blades to control the flow of oil.

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