This photograph, taken c. 1977 shows the original subway station at St. Enoch with the modern entrance to the station being dug out from underneath. The tops of the escalators are (very approximately) where the beam is in the foreground.
During the modernisation of Glasgow’s subway system in the 70s, there were a number of alterations to stations and many were replaced with modern stations but the old St Enoch station survives today.
If you’re interested in finding out more about how the Subway has changed since it opened, there’s a wee post about its ‘ghost station’ which you can read right here.
I’m afraid I’ve had this photo kicking around so long that I’m not sure who originally took it. If you know, please drop me a message and I’ll add a credit.