Hi Roger,
The inclined plane at Foxton works, or worked on the balance principle. As one trough with boat and water was being raised up the incline, another trough with or without boat was being lowered down the incline, both being attached to each other by cables and chains to a, I think, 25 rated horse power steam engine. The two troughs weighed roughly the same, therefore balanced each other.
The troughs ran on rails, similar to railway track rails.
I am in danger of waffling on here and confusing you. If you go to the website of the Foxton Inclined Plane Trust I believe it explains the principle there.
www.fipt.org.uk