See attached photo (sorry about the quality - crop from a phone pic.). The object of curiosity is a large shaft or circular manhole (stop sniggering at the back there) with rungs built in which has appeared at the end of the rebuilt platforms 3 and 4 at Glasgow Queen Street. It seems to go down a fair depth. Is it for drainage or cable duct inspection perhaps? I've been lurking around there quite a lot and didn't notice the early stages of this happening.