Here is the letter that Lionel Invine wrote.

Verbal abuse

My 19 year old daughter caught the 21.42 from Liverpool lime street to Blackpool north on April 19th 2012.
She was subjected to verbal abuse including swearing at her and insulting comments towards her and others in the carriage.
The man was drunk and causing general disorder.
The train was only one carriage so she was unable to move away from him, just had to put up with the constant abuse from Wigan where the man got on to Preston where he got off the train.
The ticket collector on that train was well aware of what was happening and failed to do anything as he said ''he didn't want to cause any trouble on the train''.
In our opinion the man should have been put off the train at the first opportunity as she was very upset and frightened when she arrived home.
This is unexceptable behaviour and would get attention from the police if it was on the street, so why should anyone have to put up with it on a train which is an enclosed environment where you cannot move away from the problem.
A look at the cctv from that train should show the problems

Hello Lionel

FixMyTransport Volunteer here

The British Transport Police would be very interested in having further details about your daughters experience. They are available on 0800 405040. Please proceed quickly as it will allow the BTP to take CCTV from the stations and train if it is available.

Kind regards

Not that many stops between Wigan & Preston and there is a BT Police office on Preston Station. As with a lot of trouble on trains it can be more prudent to keep a train moving and arrange for the Police to meet it rather than the great disruption likely to happen if the train crew try to eject an unruly passenger.

You can also act by calling BTP directly on the number previously noted by Peter from the train and ask for the train to be met, at the earliest convenient point.