I worked at British Steel Clydesdale Works from 1975 to 1983, Scrap was brought into the works in trains of around 30 x standard 12T mineral wagon and unloaded by magnet crane, the source of the scrap was one of the well known destroyers of steam - G.H. Campbell of Airdrie. Outgoing finished goods were seamless tubes for linepipe and construction use, some went south for conversion to RHS. Semi-finished tube to API casing spec for the north sea oil industry went by rail to the Imperial Works in AIrdrie for application of the thread and coupler, Bogie Bolsters were used for the longer tube, with STV tube wagons for shorter lengths.
The rail deliveries for Ravenscraig also passed the works, with Lime from Shap, imported ore and coal from Hunterston. Outgoing coil went initially to Gartcosh works, when that closed it went south to one of the works in England
Jim