Hello,
(New here but have been reading the forums occasionally for some time.)
Unless I'm very much mistaken, the points in question are here:
http://maps.google.co.uk/maps?ll=51.137342,1.292358&spn=0.003295,0.00825&gl=uk&vpsrc=0&t=h&z=18
They're near to Buckland in Dover, which is actually between Dover Priory and Kearsney on the Canterbury/Faversham line (Shepherds Well is the next station up and where trains are now terminating.) They switch trains between Canterbury and the Ramsgate line.
This (published by Network Rail on Twitter a few hours ago) is the greatest level of detail I've been able to find so far:
http://www.twitlonger.com/show/f5j9hp
South Eastern were putting out a line earlier saying that the repair would be delayed due to access to the site, but Network Rail seem to be saying it's down to the particular part. (Anyway, if it just part of a set of points, surely the easiest way to reach it is by rail?)
There has been bad weather in Kent this week. Also the new signalling on this line (control room in Gillingham) was switched on a week ago (a few days later in North East Kent.) Most people seem to believe that these points were among the 80 replaced as part of the programme, but I've not heard anyone confirm that and the work has been going on for up to 2 years so who knows when it was actually done.
(I'd add I was quite suspicious before NR put their statement out; it occurred to me - pure speculation I'd add - that perhaps the points had been set incorrectly when a train passed over them, and perhaps as a result there had been damage to the track or train.)
"Some" trains during the morning peak are going to run from Dover via Canterbury/Faversham (would be interesting to know the working procedure for *that*) but the rest of the time the line will be set to Walmer, Deal and Sandwich. Intermediate rural stations like the one I closest to me aren't too badly affected (same frequency of trains) but if you actually need to get to Dover from Canterbury it's a pain (if you're in London you're far better off going via Ashford.) Maybe Southeastern will allow travel on normal tickets on HS1 (though I suspect not.)
Obviously hearing from someone who actually knows what's happening would be a nice change from relying on my own guesswork...
(This comes a few days before the Hastings to Ashford via Rye line closes for a whole 9 weeks due to work on the Ore tunnel.)