SIX-carriage trains are expected to be introduced on the busy North Berwick line in February as part of a temporary fix to ongoing overcrowding problems.

ScotRail has said it is looking into using the extra carriages as part of a driver-training programme on the line for three months to try and help commuters.

However, they have warned it will be a short-term solution for the ongoing issues, with the first of the new trains, which are expected to be introduced in East Lothian, not expected to arrive before autumn next year.

Complaints about the service from North Berwick to Edinburgh have been made repeatedly throughout this year as passengers waiting at Musselburgh often found themselves unable to get on the packed four-carriage trains at peak hours.

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Problems with services in Glasgow and Edinburgh saw Humza Yousaf, the Scottish Government's transport minister, make an emergency statement to MSPs last month in which he said ScotRail had 'learned its lessons' following a series of problems with the service.

Iain Gray, East Lothian MSP, wrote to the transport minister to vent his anger after help was promised for the Borders railway services while East Lothian was not mentioned.

But now ScotRail have revealed they are looking at introducing the longer trains for a three-month respite period on the North Berwick line.

The six-carriage Class 380 trains are used as part of a driver training programme.

A spokesperson said: "We’re looking at options to bring more carriages onto the North Berwick line for part of 2017 before the cascade of trains, as a result of the huge fleet expansion coming from September onwards, is complete.”