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The pressure in the cylinder is plotted versus the cylinder volume. This was developed by James Watt and John Southern to improve the efficiency of the steam engine. The work done is the area within the red curve. more...
A device used to add water to the boiler. There are two common types, `live' steam which uses steam directly from the boiler, and `exhaust' steam which uses steam exhausted from the cylinders.
Where it is necessary to have two consecutive stop signals within station limits before the station platforms are reached in the normal direction of travel, the second of the stop signals is called the inner home. Where there are more than two home signals, they are usually numbered.
Steam-locomotive cylinders which are located between the frames.
A vehicle frame which is entirely located between the wheels.
A steam-locomotive valve-gear which is entirely located between the frames.
The means by which the movement of signals and points are co-ordinated to prevent conflicting train movements occurring (ie collisions).
A fully track-circuited block-section, located between two normal block sections. Each line of the intermediate block section is controlled by the signal-box of the block post in rear.