Made me think, Scilly being known for the drowned landscapes between the islands, and then, elsewhere, tidal roads and the like, of which the west country has a few.
I was thinking that there can't be locations on the
UK▸ passenger rail network similarly afflicted, and then reminded myself of the last bit of the Looe branch and also, er, Dovey Junction... but perhaps those two are dependent on a bit of fresh from the river as well as a spring tide to back the water up.
Which in turn put me in mind of the following image captured from the web cam of a guest house that overlooks the railway north of Barmouth. In this case the culprit was a storm surge coupled with a push from the local weather: it was not a good day for people on that coast.
Mark