Commuters have faced major disruption to train services through Monday into the evening rush hour.
National Rail says disruption to trains in the Denmark Hill area will continue until 5pm when the service is expected to recover.
All trains via Denmark Hill had been halted since 5am due to a signalling fault, but lines have since reopened.
Some trains may still be cancelled or revised, National Rail has warned.
On the TfL network, the Circle line is suspended due to a fire alert at Moorgate.
The same incident is causing severe delays on the Hammersmith & City line trains, while a separate fire alert at Willesden Green is causing severe delays on parts of the Jubilee line and the entire Metropolitan line.
The Metropolitan line is also suspended between Baker Street and Aldgate.
Earlier a multi-vehicle crash on the M1 northbound caused delays between junction one at Brent Cross and junction five for Watford.
Follow the latest updates below...
Incident cleared at Denmark Hill
17:15 , Niva YadavNational Rail has confirmed the incident has now cleared and services should be back to normal.
Disruption expected until 5pm
16:30 , Niva YadavThe fault at Denmark Hill has been resolved and disruption is now only expected until 5pm, an improvement on the 8:30pm stated earlier.
Thameslink trains are operating as usual.
Southeastern and London Overground services are operating with some delays.
Windrush line operating with minor delays
16:28 , Niva YadavDue to the earlier signalling fault at Denmark Hill, the Windrush line is now operating with minor delays between Clapham Junction and Surrey Quays.
There is a good service on the rest of the line.
Circle line suspended
16:25 , Niva YadavThe Circle line is entirely suspended while TfL respond to a fire alert at Moorgate.
The Hammersmith & City line is subject to severe delays in both directions.
Freight train blocks service to Victoria
16:00 , Niva YadavWhile the Southeastern service scrambles back to its feet, a freight train was reportedly stranded near the tracks of the incident in Denmark Hill, causing further delays.
Southeastern has confirmed the freight train has now moved, so both lines can resume running via Denmark Hill.
Series of fire alerts cause disruption on London Underground
15:56 , Niva YadavAs we head into rush-hour, a series of fire alerts at multiple stations have caused disruption on several London Underground lines.
There is no service anticlockwise on the Circle line and no service westbound between Hammersmith and Barking on the Hammersmith and City line due to a fire alert at Moorgate.
There are severe delays on eastbound on the H&C line and clockwise on the Circle line.
An earlier fire alert at Willesden Green has caused minor delays on the entire Jubilee line and severe delays on the Metropolitan line.
The Metropolitan line is also part suspended between Baker Street and Aldgate.
Signalling system has been fixed, say Southeastern Railways
15:10 , Niva YadavSoutheastern Railways have said the signalling system at Denmark Hill has now been fixed, after a fault was first identified at around 5am this morning.
In a post on X, the operator said the first trains will be the 15:03 service to Gravesend from London Victoria and the 14:15 service from Gillingham to London Victoria.
⚠️ UPDATE: We have received a further update that the signalling system has now been fixed at #DenmarkHill
— Southeastern (@Se_Railway) May 11, 2026
🚆 First trains will be the 15:03 Victoria - Gravesend and 14:15 Gillingham - Victoria
🎫 Ticket acceptance remains in place at this time
Disruption to last until 8:30pm
14:50 , Matt WattsThe major disruption to trains via Denmark Hill will last until 8:30pm.
Routes on the Windrush line on the London Overground network will not run between Clapham Junction and Surrey Quays.
Southeastern routes to and from London Victoria are also impacted, including services from Gravesend , Orpington, Swanley, Dartford, and Gillingham.
Thameslink services are also affected between Sevenoaks/Orpington / Beckenham Junction and London Blackfriars, and between Brighton and Bedford, and between Sutton and Kentish Town / St Albans City, and also between Orpington and Luton.
Passengers are being advised to check before travelling.
Good service on all other lines
13:12 , Niva YadavTfL is reporting a good service on all lines, except the Windrush line.
The Windrush line on the London Overground network has been suspended between Clapham Junction and Surrey Quays since around 5am this morning.
The rest of the line is operating as usual.
Trains via Denmark Hill remain cancelled
12:42 , Niva YadavTrains via Denmark Hill are still cancelled or experiencing huge delays.
The incident was first reported at around 5am this morning and is not expected to be resolved until around 3pm.
All lines reopened between Tottenham Hale and Hackney Downs
12:15 , Niva YadavFollowing an earlier points failure, trains are now running from London Liverpool Street.
The incident between Tottenham Hale and Hackney Downs has been resolved according to National Rail.
Use Catford Bridge, say operators
12:03 , Niva YadavPassengers looking to travel from Catford station are being advised to use Catford Bridge, which is located around five minutes away.
Tickets are being accepted at no extra cost while no trains are running from Catford Station.
Southeastern services to and from London Bridge are running from Catford Bridge.
Points failure disrupting lines from London Liverpool Street
11:46 , Niva YadavSeveral routes are being impacted by a points failure between Tottenham Hale and Hackney Downs.
Those routes include services from London Liverpool Street to Stansted Airport, Cambridge North, and Hertford East
Delays on the M1 after multi-vehicle collision
11:25 , Niva YadavThe M1 was closed between junction one at Brent Cross and junction five for Watford.
The road has reopened but drivers are being warned of delays.
What is a signal failure?
11:10 , Niva YadavBetween 2018/19 and 2024, National Rail reported more than 37,000 signal failures across British railways.
The District, Jubilee, Metropolitan, and Northern Lines are all key culprits for being the most affected.
But what actually is a signal failure?
A signal failure is a railway fault where the systems loses connection to data including track occupany and train locations. Therefore, it defaults to a red stop signal for safety, grinding all trains to a halt until it is fixed.
It can be caused by bad weather impacting the circuit, power failure, or equipment issues.
Which stations are not being served by Thameslink services?
10:55 , Niva YadavThe following trains will not be served by Thameslink services at this time:
- Ravensbourne
- Beckenham Hill
- Bellingham
- Catford
- Crofton Par
- Nunhead
- Peckham Rye
- Denmark Hill
Good service on the Central line
10:45 , Niva YadavService has resumed on the Central line, with TfL reporting that all earlier delays have now cleared.
The Windrush line is still suspended between Clapham Junction and Surrey Quays in both directions.
Other than that, there is a good service on all other lines.
National Rail reporting no service via Denmark Hill
10:37 , Niva YadavNational Rail is still reporting no service via Denmark Hill until approximately 15:00.
This include trains between Gravesend and London Victoria and some routes into London Blackfriars.
Tickets are being accepted on London Buses via all reasonable routes at no extra cost.
A visual disruption map video is available here:
Southeastern reporting ongoing delays
10:01 , Niva YadavSoutheastern Railway is reporting ongoing delays due to the signalling system fault at Denmark Hill.
⚠️ONGOING: Fault with the signalling system #DenmarkHill
— Southeastern (@Se_Railway) May 11, 2026
🎫You may use your ticket at no extra cost on London Underground between London terminals and London buses between Lewisham and Victoria.
The operator said tickets can be used on the TfL network between London terminals and on bus routes between Lewisham and Victoria.
Disruption is still expected until 3pm today.
RMT Tube strikes kicking off next week
09:56 , Niva YadavCommuters can expect more railway chaos next week as more Tube and bus strikes are on the horizon.
Two 24-hour walkouts are lined up on Tuesday and Thursday next week, spilling across four working days.
You can read the full story here to get the latest.
Am I entitled to a refund?
09:50 , Niva YadavIf your journey was delayed by 15 minutes or longer, you may be entitled to a refund via the Delay Repay scheme.
Visit your train operator’s website to find out more.
What to do if your route has been affected
09:36 , Niva YadavIf your commute has been impacted by this morning’s delays, you can use your ticket on the following alternative services at no extra charge:
- London Underground between Southeastern London terminal stations
- London Buses between Lewisham and London Victoria
You can also refer to National Rail’s website here to find an alternative route.
Major disruption expected until 3pm
09:23 , Niva YadavNetwork Rail has said disruption is now expected until 3pm.
The group is investigating the cause of the signal failure.
Minor delays on the Central line
09:07 , Niva YadavThe Central line is reporting minor delays in both directions between White City and Ealing Broadway/West Ruislip, and between Leytonstone and Epping/Hainault.
This is due to train cancellations. There is a good service on the rest of the line.
Disruption continues on Windrush line
08:51 , Niva YadavTfL is still reporting delays on the Windrush line, with no service between Clapham Junction and Surrey Quays.
Disruption is expected until midday.
Mildmay line resumes service as usual
08:34 , Niva YadavTfL is now reporting a good service on the Mildmay line.
The London Overground line was subject to suspension and severe delays earlier this morning.
Which routes are affected?
08:25 , Niva YadavIn addition to disruption on the Windrush line, routes on the Thameslink and Southeastern network are impacted by the signalling fault at Denmark Hill.
On the Thameslink, the following routes are affected in both directions:
- Welwyn Garden City / London Blackfriars - Sevenoaks
- Luton / West Hampstead Thameslink / Kentish Town - Orpington
On the Southeastern service, the following routes are impacted:
- Trains between Gravesend and London Victoria via Bexleyheath are cancelled
- Trains between Gillingham and London Victoria will not call at Denmark Hill
- Some trains between Orpington and London Victoria are cancelled
- Some trains between Beckenham Junction and London Blackfriars are cancelled
Passengers should check before travelling.
Delays on the A2 London-bound
08:18 , Niva YadavMotorists should expect long delays on the A2 London-bound this morning following a car crash near Pepper Hill in Gravesend.
Two of four lanes on the A2 are closed with long delays into London.
'Minor delays' on Mildmay line
08:15 , Niva YadavFollowing a suspension and severe delays earlier this morning, the Mildmay line is now getting back on its feet.
TfL is reporting minor delays between Willesden Junction and Richmond due to an earlier faulty train.
There is a good service on the rest of the line.
The Windrush line remains part suspended between Clapham Junction and Surrey Quays due to the signalling incident at Denmark Hill.
Disruption expected until midday
08:12 , Niva YadavDisruption across the London Overground, Thameslink and Southeastern networks is expected until midday.
Passengers are being advised to seek alternative routes and to check before they travel.
'Severe delays' on Mildmay line
07:37 , Michael HowieIt looks like trains are now running again along the whole of the Mildway line.
Transport for London (TfL) is no longer reporting the part-suspension but says the line is facing “severe delays”.
Signal fault sparks 'major disruption' on railways
07:30 , Michael HowieThe signal fault at Denmark Hill is also causing “major disruption” to National Rail services.
Southeastern trains into London Victoria and Thameslink trains into Blackfriars are among those impacted.
National Rail says the problem means trains will be cancelled, delayed by up to 30 minutes or revised.
London Overground chaos
07:18 , Michael HowieTwo Overground lines are part-suspended as rush hour gets going.
The Mildmay line is suspended between Willesden Junction and Richmond due to faulty train at Acton Central.
Meanwhile, the Windrush line has no service between Clapham Junction and Surrey Quays because of a signal failure at Denmark Hill.
Good morning
07:17 , Michael HowieThe Standard is launching its coverage of travel news as millions head to work at the start of the week.
We’ll keep you informed of all the major developments throughout Monday morning.
