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🚂 How a steam locomotive is driven

Follow heat from the firebox into steam, through valves and cylinders, and out to the rods, wheels, controls, and crew that drive a steam locomotive.

5
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. Fire turns water into a working fluidTrace how fuel, fire, boiler water, and exhaust create a supply of working steam.The firebox and boiler transfer energy from fuel into pressurized steam, while the exhaust helps sustain the draft.
  2. Valves send pressure through the cylindersExplain how the regulator, valves, reverser, and exhaust direct steam through a double-acting cylinder.Controls and valve gear decide when steam enters and leaves each cylinder, including direction and cutoff.
  3. Rods turn reciprocating motion into tractionConnect piston motion, rods, cranks, driving wheels, adhesion, and the locomotive frame.The running gear converts straight-line piston motion into torque at the driving wheels and usable grip on the rail.
  4. The driver coordinates a moving power plantDescribe how a driver and fireman coordinate power, speed, efficiency, water, fuel, and braking.Driving a steam locomotive means managing a moving power plant whose controls, crew, and track conditions interact continuously.
  5. Follow one load of coal through the machineSynthesize the full energy and motion pathway from fuel to traction and exhaust.A locomotive moves because heat, pressure, timing, mechanics, adhesion, and control form one coordinated chain.

Questions this course answers

What is the boiler mainly doing?

The fire heats water through the boiler's firebox and tubes, producing the steam used by the cylinders.

What does cutoff change?

Cutoff changes the fraction of a stroke during which the valve admits fresh steam, affecting effort and efficiency.

How does a connecting rod help move a locomotive?

The rod links the straight-line motion of the piston and crosshead to the off-center crankpin that turns the wheel.

Why might a driver shorten cutoff after the train is moving?

Shorter cutoff lets admitted steam expand in the cylinder, improving steam economy once starting force is less important.

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