I would love to see the reports of the tests of the "Alpine" system. Everything I have read so far points to these tests taking place on the Bunsall Incline, rather than the Whaley Bridge one, so if you could settle this matter more convincingly than you managed to persuade me about the fate of Errwood Hall's gateposts, that would be excellent!
The Alpine system was invented by John Barraclough Fell, and is still used on the Snaefell Mountain Railway on the Isle of Man, and was previously used on several railways across the Alps. Unlike other systems, which used a rack between the rails, Fell's method used an extra rail, laid sideways on supports between the normal running rails. Wheels, either side of this centre rail "gripped" it, using very strong springs to ensure a firm contact.
I have this referring to the tests:
"The first engine . . . . was intended to test the system for application to the Mount Cenis Railway (In Italy). It was tried on a track 800 yards long, of 3' 7½" gauge' laid on a gradient of 1 in 13½ on the High Peak Railway"
Now Bunsall Incline was 455 yards at 1 in 7, and then 660 yards at 1 in 7½, which doesn't really fit in with the description above.
Shallcross Incline was 817 yards at 1 in 10½, so the length suggests the tests might have been here, though the gradient is different.
Whaley Incline is only 180 yards long, but it is 1 in 13½, so the gradient matches, but it's hard to imagine where JB Fell found the extra 620 yards of uphill, if this was the location!
Ahh, another bit...
"180 yards of Fell's test track was straight, with a gradient of 1 in 13, 150 yards with a gradient of 1 in 12, with curves of 2½ chains radius" Maybe it went up Bings.
And finally, while looking all this up, I perhaps discovered how our friend G.Jackson knows so much about horses: The following is an excerpt from a description of a trip from Cromford to Whaley Bridge on the "fly" train - the fast(ish) through train that conveyed passengers.
"Going forward, the fly was taken in charge by George Jackson who did shunting here (Shallcross Yard) with a horse, and he took us forward to Whaley Bridge Good Shed."