This is what the West of England main line at Dawlish looked like this week. Plymouth and Cornwall are now cut off from the national rail network and may be for a while to come. Before 1968 this would not have happened as there was another route from Exeter to Plymouth passing to the North of Dartmoor, through Okehampton and Tavistock. Indeed until 1958 there was another line between Exeter and Newton Abbott along the Teign Valley. I wrote about them here.
The point is that, even fifty or so years ago, there were concerns about rising sea levels at Dawlish and voices were heard warning about the dangers of closing and lifting alternative routes. They were ignored. But what is to be done now? Well, for a change long term thinking is needed. Reopening the Tavistock route may not be possible even though a significant portion of the trackbed remains intact and there has also been talk of reopening the Teign Valley line. There is also the possibility of raising the level of the line at Dawlish. None of these options is cheap. Network Rail comes onto the public sector balance sheet on September 1st which will certainly must mean reluctance from the government to increase its debt which already stands at £32 billion. Expect more make do and mend. And more disruption on the network.