An interesting set of photos, with not much railway, but a lot of interesting engineering.   They show construction of the Katrine aqueduct, that provides water to Glasgow.  I did some hydraulic analysis on the treatment works at the end of the tunnels a while back.

Old photographs showing one of Scotland’s most important public works being built have been found in a skip.  The photos show the construction of one of the Katrine Aqueducts, which take water to treatment works that supply 1.3 million people around Glasgow. The aqueducts were part of a radical 19th Century plan to supply fresh water from Loch Katrine to Glasgow, 35 miles away.