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Contents 1

The Great Change 1

The Diesel Locomotive Power Plant 3

How the Diesel Engineorks 6

The Miracle of Combustion 8

The Ways in Which Diesel Engines Vary 11

The Four-Stroke Cycle of Operation 13

The Two-Stroke Cycle of Operation 16

Fuelling the Locomotive Power Plant 19

Combustion Needs Air—How It Is Supplied 22

Keeping the Engine Cool 24

Transmitting the Power to the Locomotive Wheels 26

The Mystery of Torque 28

Hydraulic Transmission 30

Mechanical Transmission 33

How the Diesel Locomotive Makes Use of Electricity 35

How the Locomotive Runs on the Track 37

Controlling the Locomotive 40

How the Driver Brakes the Train 42

Electric Locomotives 45

Power Supply 46

Power Protection and Collection 48

Traction Motors 50

Power Equipment 52

Cab and Controls of an Electric Locomotive 54

Vocabulary 56

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