A rail worker has been injured after being stabbed at Euston Station (Google street view) (Image: Google)

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A man has been arrested by armed police after a railway worker was stabbed on a train at a busy central London station.

Train to and from Euston Station delayed and cancelled as officers carrying guns boarded a train as it sat at the platform just after 7am this morning.

Two people were taken to hospital with stab wounds after what was described as an "appalling" attack on a station employee.

A man has been arrested on suspicion of causing grievous bodily harm, British Transport Police (BTP) said.

Shocked passengers described the moment heavily armed cops searched the carriages for the attacker.

A woman on a train on the next platform wrote on social media: "Well, this is dramatic. Train being held at Euston following violent assault on the adjacent train. Four heavily armed officers keep passing through the train searching for the aggressor, and nobody can leave the train."

Police confirmed the arrest and said both the victim's injuries are not thought to be life-changing or life threatening.

Were you on the train when the incident took place? Email [email protected]

A rail workers union said the attack has sent "shock waves" through the industry.

RMT general secretary Mick Lynch: "This is an appalling incident that will send shockwaves through the whole railway family, and our thoughts are with our member, his colleagues and his family this morning.

"While we await the full facts, the union will be providing practical support to our member and the workforce at Euston as the police investigation continues."

Euston Station disruption is expected all day (stock image)
(Image: @TuffClub)

A spokesman for BTP added: "We were called to Euston railway station at 7.09am today following reports of a serious assault on-board a train.

"Specialist officers were deployed, and a person has been arrested on suspicion of grievous bodily harm and conveyed to police custody.

"Two people have been taken to a local hospital for treatment to laceration wounds. Their injuries are not believed to be life-changing or life threatening."

Network Rail has tweeted to say there will be disruptions to services to and from the station.

It said: "Delays and cancellations expected to continue this morning, following an incident where a member of our staff was injured."

"Ticket acceptance via other routes. Please check before you travel."

Avanti, the operator of the affected train, said the firm has received many messages of support for their employee.

A spokesman said: "We can confirm a member of staff was injured following an incident at Euston Station this morning and we are supporting the British Transport Police with their investigation.

"They are recovering in hospital and their family has been informed. We are providing support and assistance to our colleague and their family at this worrying time as well as our people who have been affected by what has happened.

"Our thoughts are with our colleague and everyone else involved. We would also like to thank those from across the industry who have sent messages of support and good wishes. It’s a true reflection of the railway family."