Pilot Truck
The leading small trucks on a locomotive also referred to as a Pony Truck.
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Pilot Truck
(Also lead or leading truck). The truck located in front of a steam locomotive's drive wheels which, in addition to providing support, helps guide the engine into curves and turnouts. See also "Pony Truck."
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A 2-8-8-4 has a pilot truck of two wheels, two sets of eight driving wheels each, and a four-wheel trailig truck. This is a "Yellowstone," an articulated engine.
I held my chassis modification to the front cylinders, replacing the pilot truck and cutting down the oversize flanges of the trailing truck. The superstructure cried out for a bashing and I yielded to temptation. The cab now has a B.W. RR look.
A 2-10-0 steam locomotive (2-wheeled pilot truck, 10 driving wheels, no trailing truck).
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Bogie Truck
A four-wheel pilot truck on a steam locomotive. (Also used for some "Road-Railer" units.) ...
That is fine for slow speeds, but at high speeds it can lead to derailments. Someone got the idea of adding a pilot truck to the front of a locomotive, to guide it into curves. The pilot has more side-to-side flexibility.
Pilot Truck - The front or leading small trucks on a locomotive also referred to as a Pony Truck.
Piston - The head which moves inside the cylinders of a steam locomotive when pressured by steam.
 See also: Signal, Special, Track, Locomotive, Roadbed
  
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