And, AND, another colleague told us about The Noises From The Wall.
There are tunnels under Crewe Station which were used by the Post Office for moving wagons with sacks of mail between platforms. (I did that work and it was very physical and strenuous!)
These days some of the old GPO tunnels have been converted for use as passenger walkways, and very smart they are too.
One is thoughtfully preserved in its original condition - peeling ancient paint on bare brickwork, crumbly concrete floor, buzzing overhead lights, ferns growing out of walls, water dripping, rumbling of trains overhead, etc - as a staff-only passage. Possibly the most Gothic place in Crewe.
Anyway...
When the tunnels were being tidied up and incorporated into the new station entrance, a brick wall at one end had to be taken down and the ground behind it excavated. The workmen set onto it heard weird noises all the time they were there, like moaning and groaning, maybe a bit of screaming. It rattled them enough for some to walk off the job and they still won't walk through there.
Most excitingly, I'm told that a recording of the sounds exists, and is available on YouTube!