A man has received £13,000 compensation after he was unlawfully arrested and assaulted.
Peter Garrigan, 26, of Kirkby, Merseyside lodged a civil claim against British Transport Police (BTP) following an incident at Liverpool Lime Street station in March of 2009.
A jury at Liverpool Civil Court found an officer performed an unlawful arrest, assault and behaved improperly.
BTP apologised for the "failings". An internal investigation is taking place.
Mr Garrigan suffered injuries to the head, face and shoulders when he was arrested and assaulted.
Iain Gould, of David Phillips and Partners solicitors, said: "Mr Garrigan was a young man of exemplary character whose faith and confidence in the police is shot."
A BTP spokesman said: "We expect the very highest standards from our officers and staff and when someone falls to live up to those standards, it is a matter of great regret.
"We would like to apologise to Mr Garrigan for the failings in this case.
"This matter has been passed to our Professional Standards Department following this verdict and a full and thorough investigation will be carried out."