The same thing happened some years ago in sweden. A train derailed when the railway as well as the road was washed away. No sleepers fell off then either. But that was E-clip. Fastclip is good. In sweden we started to use it last year. But it was used when the railway to Arlanda was built in the 90's.
Fastenings that have been used in sweden can be seen in my blog in a post from yesterday;
http://bantekniker.bloggplatsen.se/2...06-befastning/