 The private railway would run southwards for about eight miles (13 km) along the valley of the River Tweed from a location somewhat east of Broughton station.The Caledonian agreed to lay a second track, at the expense of the Water Trust, alongside its own single line from Broughton station to the point of divergence of the new railway.At first a northwards branch line at Broughton was planned to extract clay for sealing the reservoir, but this was later changed, and the material was imported from elsewhere.