Second signalling fault on rail network causing serious disruption between Luton and London St Pancras

A second signalling fault on the rail network is causing major disruption for London commuters this morning.

Trains between Luton and London St Pancras International are running at reduced speeds due to a fault near Radlett, with delays of up to 45 minutes and cancellations expected until at least 1pm.

Some services may be delayed, cancelled, or revised by up to 45 minutes.

It comes after disruption at London Marylebone earlier on Wednesday, after another signalling system fault hit services during the morning rush.

As of 11am, the issue was continuing to delay Chiltern Railways services after the issue caused major rush-hour disruption.

National Rail is reporting that, while lines have now reopened, problems are expected to last until 11.30am.

Meanwhile, no issues were being reported on the London Underground .

Follow the latest updates below...

Fault on a train at London Bridge
Trains running through London Bridge may be delayed by up to 20 minutes, cancelled or revised.

Disruption is expected until 12.15.

Second signalling fault at London station causing travel chaos
A second signalling fault on the rail network this morning is causing delays to Thameslink and East Midlands Railway services running between Luton and London St Pancras.

A fault at Radlett means trains are having to run at a reduced speed on all lines.

Trains running between Luton and St Pancras International may be cancelled, revised, or delayed by up to 45 minutes
Disruption is expected until 1pm.

Disruption expected until 11.30am
Disruption at London Marylebone is now expected until 11.30am after a signalling fault brought services to a halt this morning.

Major disruption expected until 10am
Major disruption at London Marylebone is now expected until 10am.

Passengers are advised to seek alternative routes where possible.

You can check your journey in advance using the National Rail Journey Planner.

Which routes are affected by delays?

Chiltern Railways services between Stourbridge Junction, Birmingham, Banbury, Kings Sutton, Oxford, Aylesbury, Princes Risborough, High Wycombe, Gerrards Cross, West Ruislip, and London Marylebone are affected by the disruption this morning.

Anyone travelling to these stations has been advised to take CrossCountry, Avanti West Coast, GWR, or LNWR services travelling north.

Passengers can use the same ticket.

Services depart from London Euston station.

Good service on all London Underground lines
On a positive note, there is good service across the London Underground network this morning.

Major disruption expected following signalling issue at London Marylebone
An earlier signalling fault at London Marylebone railway station is causing major disruption on the network.

All lines have reopened, but trains are still having to run at a reduced speed through the area.

Delays of up to 30 minutes are expected as a result.

Some services may be revised or cancelled.

Major disruption is expected until 09.30am.