A combination of a high tide and strong winds will make it unsafe for trains to travel along the sea wall at Dawlish today from 9:30 until 11am.
Source:http://www.devonlive.com/news/devon-news/live-news-traffic-travel-updates-813211
They should try out the new iep class 802 and see if that can stand up to a good dousing in salt water.