Rail passengers are being reminded to check how their journey will be affected by major improvement works at one of Scotland's busiest stations.

The Queen Street tunnel in Glasgow will be closed for five months from Sunday, with trains diverted to either Queen Street low level or Glasgow Central Station.

ScotRail said the tunnel is being upgraded to allow faster, longer and more environmentally friendly trains to run between Edinburgh and Glasgow.

The diversions are expected to add around 25 minutes to most journey times, according to a spokesman for the company.

During the tunnel work, travellers are being advised to arrive ten minutes early at Queen Street, where there will be queuing systems to board low level trains.

ScotRail Alliance spokesman Rob Shorthouse said: "We are just days away from the start of the biggest, most important improvements to Scotland's rail network for many years.

"We have spent the last few weeks doing everything we can to make sure customers understand the changes to journeys that are necessary.

"However, with just a few days left, we are urging anyone who has not yet planned how they will travel for the next five months to do so.

"Trains are running, we are open for business. However, some services are being diverted and journey times will take longer than normal."

To add extra capacity to the network, three Class 320 electric trains entered service for the first time this week - the first of seven which will add 21 extra carriages and 14,000 extra seats to the ScotRail fleet.

ScotRail has also set up a page on its website to provide customers with information about the changes.