The train I get along the Fife coast on the way into Edinburgh is so close to the sea I often find myself wondering if you could jump from the train into the sea...

Probably could between Aberdour and Burntisland, as you pass silver sands

In the Bay Area today, a section of Amtrak's Capital Corridor passes through the salt ponds and the Baylands marshes which is also quite reminiscent.

the California reference document on this topic might be .. a 71 page April 2017 pdf .. "Rising Seas in California -- an Update on Sea-Level Rise Science" through California OPC_SAT

Link: http://www.opc.ca.gov/webmaster/ftp/pdf/docs/rising-seas-in-...

It's a few pages before it becomes California-specific.