Yes, that's it - the Heilan Man's Umbrella. It is still there. The thing is that the bridge takes quite a few railway tracks from Central Station across Argyle Street before crossing the Clyde, and this means it wasn't like going under your usual bridge and straight out again. It was, and still is, quite a distance to the other side. The air used to be polluted at times
under the bridge. They said it was bad for your lungs but I never noticed it.