Services between the two destinations were stopped but all other lines remained open, a Metrolink spokesman said. No one was injured.
The spokesman described the incident at 1.50pm on Boxing Day as a 'minor derailment' and said an investigation was underway to determine the cause.
He added: "A small area around Market Street was affected after the front of a carriage went off the rails".
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Wes Brown (27/12/2008 at 19:40)