A partially constructed building that forms part of the Glasgow Queen Street Station project could be demolished as officials consider a larger development, according to reports.

Transport Scotland has ordered a review of the building in the car park, for rail staff and shops, as part of expanding the station to accommodate new electric trains on the main line to Edinburgh this year. The trains are finally due to start running in March, but other delays to the £800 million Edinburgh Glasgow Improvement Programme (Egip) have already put back completion of the station until 2020.

Now The Scotsman has reported that officials are considering bringing down part of the ongoing project in favour of a larger development in the car park.

According to the newspaper, the estimated cost of the U-turn is between £3m and £15m.

Network Rail said: “We have paused work while we explore potential changes to the scope with the Scottish Government.

“If the discussions result in a new development, then we’d most likely have to remove the steelwork.”

Transport Scotland said it would not delay longer trains and faster journeys in December, platforms being extended by December 2019 and the station concourse and frontage being completed by spring 2020.

A spokeswoman said: “Following the conclusion of Scottish minister-led discussions, options for an alternative development at the North Hanover Street site are being explored. These are expected to conclude in the coming weeks.

“All other works continue as planned.”