Reynolds constructed three
tub boat canals, which brought coal and iron ore a short distance from local mines to the ironworks. Built from 1787 to 1788, they were the
Ketley Canal, the
Wombridge Canal and the
Shropshire Canal. They included an invention of Reynolds, an
inclined plane: this was a method of raising canal boats from one level to another.
Visiting engineers During this period, the reputation of Coalbrookdale encouraged visiting engineers who tried new ideas.
Thomas Telford knew the Coalbrookdale company since he had become Surveyor of Public Works for Shropshire in 1787. Reynolds constructed
Longdon-on-Tern Aqueduct for Telford, a cast-iron
aqueduct, assembled in 1796, carrying the
Shrewsbury Canal across the
River Tern at
Longdon-on-Tern. (Telford, encouraged by its success, used cast iron for the
Pontcysyllte Aqueduct). In January 1802
Richard Trevithick came to Coalbrookdale, where boiler plates for steam engines had been made for some time. He built and tested a stationary engine which operated with an unprecedentedly high boiler pressure of 145
psi. Trevithick, who had built a road locomotive in Cornwall (the
Puffing Devil), then worked, probably with Reynolds, to build a locomotive at Coalbrookdale that ran on rails; few details are known about this experiment, which is thought to be the first occasion of a locomotive on rails. ==Reynolds and Darby families==