A fire near Heathrow Airport could lead to cancellations and disruption on the railways in west London.
Passengers are being warned of problems between Paddington and Heathrow because of a blaze in Southall.
Transport for London announced the "severe delays" just after 6am this morning (Tuesday, November 27).
UPDATE - A train has derailed at West Ealing causing 'major disruption' - get the latest on that here
It said on Twitter: "Severe delays between Paddington and Heathrow Airport due to a fire near the railway at Southall.
"Tickets are accepted on London buses, and on London Underground via any reasonable route.
"We apologise for the inconvenience caused this morning."
Announcements on the London Underground are warning passengers about the railway problems, saying that the fire is close to Heathrow Airport.
Unconfirmed early reports suggest Great Western Railway trains are also affected and that no Heathrow Express services are running.
The London Fire Brigade has been contacted for comment about the extent of the blaze.
Scroll down for the latest updates on this story.
Are you affected? Email liam.trim@reachplc with your photos and information.
Key Events
The Southall fire explained - what we know so far
An investigation has been launched into the cause of a fire next to Southall train station - which started a day of delays on the trains in west London.
Around 40 firefighters tackled the fire earlier.
National Rail on 'major disruption'
National Rail are referring to today’s delays as ‘major disruption’.
The delays caused by the fire earlier have been eclipsed by the West Ealing derailment disruption.
For the latest on the derailment go to our other live blog here
An operational incident at West Ealing is causing major disruption between Slough / Heathrow Airport and London Paddington. Trains may be cancelled or delayed by up to 45 minutes.
Disruption is expected until 10:00.
The disruption caused by a fire near the railway at Southall earlier today has now ended.
All the photos of the chaos at Southall so far
The queues are absolutely packed because of the delays
You can see why you would want to escape the queues
Fingers crossed these passengers are moving again soon
Some passengers are giving up
There are those who are asking Great Western Railway for answers...
And those who are throwing in the towel...
Another photo of frustrated passengers packed on the Southall platform
Photo shows chaos as passengers struggle to board Southall trains
Following the earlier fire - and now a derailment at West Ealing - it’s a perfect storm, creating this sort of horrible scene for commuters
National Rail say disruption could continue until 10am
The latest advice on Twitter, despite lines reopening:
Return of good service?
TfL say a good service has resumed:
But National Rail say there could still be delays until 7.45am:
Heathrow Express 'running fine'
According to this reply from National Rail to a customer, Heathrow Express services are now running smoothly, despite earlier problems.
We will try to confirm this and bring you more as it comes in:
The fire has been put out - but delays continue
National Rail say the fire has been extinguished but disruption is likely until 7.45am:
All lines between Slough / Heathrow Airport and London Paddington have been reopened following the fire near the railway at Southall being extinguished.
Trains may be cancelled, delayed by up to 30 minutes or revised as services return to normal.
We anticipate disruption will continue until 07:45.
No Heathrow Express service in either direction
No mention of a fire here but just after 5am Heathrow Express confirmed there’s no service this morning - there has been no update since.
No reports of problems on the roads yet
This AA traffic map is not yet showing any disruption on the roads in the Southall and Heathrow Airport area this morning
The fire is likely to affect journeys beyond London
There’s a warning here about passengers in Henley on Thames being affected.
Great Western Railway trains between Paddington and Slough are also likely to be impacted - which could mean lots of services to and from London Paddington facing hold ups
Screens are displaying confusing information for Heathrow Express passengers
We will bring you more information as soon as it comes in but it seems likely there will continue to be delays to services while the fire is dealt with this morning
