Bedford and Luton rail passengers face delays and cancellations on Monday morning
Points failure causing problems on Thameslink journeys to the capital
Thameslink passengers heading to London face delays and cancellations during Monday's morning rush-hour.
The operator says a points failure on the route to St Pancras International is disrupting services from Bedford and Luton.
A spokesman said: "All services through the area are subject to delay and may be cancelled at short notice so please check planners before you travel.
"Engineers are making their way to site but the current ETA at the problem area is 08.05
"St Albans City to Sutton services will not call at Radlett, Elstree & Borehamwood, Mill Hill Broadway, Hendon and Cricklewood until further notice.
"Please use alternative trains for these stations."