Canal inclined plane
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An inclined plane is a system used on some canals for raising boats between different water levels.
Typically, such a feature consists of a slope, up which there are two sets of rail tracks, and boats are raised between different levels by sailing into giant water-filled tanks, or caissons, which have wheels on the bottom and watertight doors at each end, and which are perpendicular to the slope. These are then drawn up or down hill on the rails, usually by means of cables being pulled by a stationary engine. In almost all designs two caissons are used, one going up and one down to act as counter-weights to make the system more efficient.
When the caisson has reached the top or bottom of the slope, the doors are opened and the boat leaves.
An inclined plane is a quicker and more efficient (in terms of water loss), alternative to a flight of canal locks, but is more costly to install and run. An inclined plane can be considered a specialist type of funicular railway.