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Transportation
Any mode or method of locomotion that serves to move people, goods or services from one location to another.
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Transportation > Railway 
mallet locomotive
Transportation; Railway
Designed originally by Anatole Mallet in 1884, the design was a compound locomotive with two sets of engines on bogie frames. Later versions were simple expansion locomotives and ...
piston valve
Transportation; Railway
The type of steam engine valve, circular in shape, designed to overcome the design defects of the slide valve, specifically steam tightness and wear.
pop safety valves
Transportation; Railway
A safety valve designed to reduce the 'dribbling' of steam from a boiler at full pressure and thus reduce wastage. They were first used in the US about 1867 and in the UK about ...
notching up
Transportation; Railway
Slang term for moving the reverser to reduce the cut off of the engine as the need for power is reduced. 'Notching up' has also been adapted by diesel and electric locomotive ...
pacific type locomotive
Transportation; Railway
A locomotive with the 4-6-2 wheel arrangement. The first 4-6-2s were built by the Baldwin Locomotive Works in the US for the NZ Railways, hence the name.
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