Following on from Monday's service meltdown on the Thameslink core route at
City Thameslink station (which was seemingly mended and then promptly broke
again), there is now a signalling problem elsewhere, this time on the
Midland mainline between Cricklewood and Radlett - from FCC JourneyCheck -
and it seems like its going to last right into the evening and night:

http://www.jcheck.com/firstcapitalconnect

---quote---
Owing to signalling problems between Cricklewood and Radlett all lines are
blocked. Train services through these stations may be subject to disruption
on all routes at short notice. Disruption is expected until 23:45 11/11.

Additional Information:
Ticket acceptance is available on LUL, local buses and Croydon Tramlink
across London. London Midland, Euston to Milton Keynes, including Watford to
St Albans Abbey. FCC Great Northern Kings Cross to Peterborough. Southern
any reasonable route.

A plan is being put together for services to run as follows:
City Thameslink to Sutton, London Bridge to Brighton, Bedford to Luton.

Bus replacement as follows,
St Albans to Hatfield, Luton/Luton Airport Parkway to Hitchin, Bedford to St
Neots.

Customers travelling to and from London are advised to travel from Kings
Cross and connect into the replacement buses.

Message Received :11/11/2011 14:29
---/quote---

More info from NRE he
http://www.nationalrail.co.uk/service_disruptions/sa34a55203f2481ca1845d3fc436cc1b/details.html

The above states that "Trains between Sevenoaks and Kentish Town are
currently suspended" and "A half hourly service will run between London
Victoria and Sevenoaks via Catford", seemingly to fill in for the former.
(These Sevenoaks services are run by Southeastern south of Blackfriars, so
FCC only half-acknowledges their existence.)

The statement that "No First Capital Connect trains will run between West
Hampstead Thameslink and St Albans" suggests that at least some FCC
Thameslink trains will get as far north as West Hampstead.


The ongoing unreliability of the Thameslink route is the stuff of legend,
which is a great shame as it's such a useful service when it works
properly - the supposed light at the end of the tunnel is the 'new &
improved' Thameslink after the extensive TL Programme upgrade, but one does
wonder whether it'll work as planned if 'they' can't get things right now (I
fear there might be a 'one day over the rainbow' attitude w.r.t. Thameslink,
meaning that there might be a temptation to brush over the failures of today
because of the beckoning promise of the bright new post-TL upgrade
tomorrow - but the new, post-upgraded Thameslink won't just magically work
properly all by itself).