Cumbria MP John Woodcock has told how he was threatened after confronting a "rowdy gang" of men on a train.
The Labour MP said the incident happened as he was returning to his Barrow constituency on Thursday night.
He said he intervened when comments by the group became "increasingly racist and unacceptable".
The shadow transport minister said he was assaulted and had a bag thrust in his face. A man is being questioned by police over the incident.
Mr Woodcock, 33, who was not seriously injured, said: "I had got on the train at Lancaster on my way home and there were a group of lads who had been drinking and were rowdy and boisterous. The kind of thing you often see on public transport late at night.
"Unfortunately their comments got increasingly unacceptable, derogatory and when they turned racist I just thought that enough was enough.
"So I got up to talk to them and fortunately I only ended up with a bag in my face for my trouble.
http://www.bbc.co.uk/news/uk-england-cumbria-17188701
The Labour MP said the incident happened as he was returning to his Barrow constituency on Thursday night.
He said he intervened when comments by the group became "increasingly racist and unacceptable".
The shadow transport minister said he was assaulted and had a bag thrust in his face. A man is being questioned by police over the incident.
Mr Woodcock, 33, who was not seriously injured, said: "I had got on the train at Lancaster on my way home and there were a group of lads who had been drinking and were rowdy and boisterous. The kind of thing you often see on public transport late at night.
"Unfortunately their comments got increasingly unacceptable, derogatory and when they turned racist I just thought that enough was enough.
"So I got up to talk to them and fortunately I only ended up with a bag in my face for my trouble.
http://www.bbc.co.uk/news/uk-england-cumbria-17188701