Commuters are being warned of potential delays to their journeys due to a major fire at Harrow , as train services between Watford Junction and Euston are not running.

More than 50 firefighters were sent to tackle the fire at a factory and offices in Chantry Place on Thursday September 14.

Dozens of concerned residents called 999 after spotting the flames and huge plumes of smoke, while social media users reported hearing explosions.

Trains affected on Friday September 15 include the Caledonian Sleeper, London Midland, London overground, Southern and Virgin Trains.

There are also severe delays on the London Overground between Watford Junction and Shepherds Bush.

A reduced overground service is also running between Shepherds Bush and Clapham Junction

For the latest travel updates, head to our live blog.

Fire grips a building in Chantry Place

Trains to Liverpool Lime Street, Birmingham New Street, and Manchester Piccadilly have been cancelled.

A spokesman for Network Rail said: "Passengers wanting to travel on the West Coast Main Line and West London Line are urged to check with their train operator or nationalrail.co.uk before travelling as disruption and cancellations are to be expected throughout the day."

Screengrab of National Rail departure board showing disruption to trains

On its website, National Rail says: "At approximately 11.55pm yesterday evening, a large fire was reported at a timber yard near Headstone Lane.

"The emergency services have worked through the night to control the blaze.

"The damage has been looked at by structural engineers and they have declared the building is currently unsafe for trains to run.

"Until the building has been made safe, trains will continue to be disrupted between Watford Junction and London Euston.

Nearly 60 firefighters were at the scene in Harrow overnight putting out the flames

"London Midland and Virgin Trains services are unable to run between Milton Keynes Central and London Euston.

"London Overground are operating between Watford Junction and London Euston.

"A reduced service will run along the West Coast Mainline."

Station Manager Jason Jones, who was at the scene, said: “We had a very well developed fire which was extremely visible from quite a way out.

“There were propane cylinders involved so a hazard zone was set up as cylinders can explode when exposed to heat.

“The site is next to Headstone Lane train station and trains were stopped.

“Crews worked very hard through the night at this challenging incident to bring the fire under control.”

Harrow fire: Major disruption on trains in and out of Euston expected throughout today

The Brigade was called at 11.47pm and the fire was under control at 3.17am.

Fire engines from Northolt, Wembley, Harrow, Ruislip, Mill Hill, Kingston and surrounding fire stations were at the scene.

A total of eight fire engines and 58 firefighters were sent to the scene after more than 30 emergency calls were received on Thursday, just before midnight.

A cordon was put in place in Headstone Lane.

The cause of the fire is not yet known.

For the latest travel updates, head to our live blog.

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