Work will be carried-out during two weekends in February and March at Hardengreen roundabout near Eskbank, just south of the Edinburgh Bypass.

Installation work will see a 1,200 tonne crane used to hoist the bridge’s four 107-tonne beams into place.

A 30-strong construction team will work around the clock to install the bridge beams and create the new bridge deck.

Hugh Wark, project director, Network Rail, said: “The installation of this new bridge structure is a major construction milestone for the team.

“Not only will it transform the visual impact of the landscape and connect the railway from north to south but it is the longest bridge to be built from scratch along the new route.

“We have managed to keep the roundabout open while we construct the bridge supports, however the installation of the bridge deck is a major undertaking which will require two weekend closures.

“During the first weekend we’ll be craning in the concrete bridge deck. During the second weekend we’ll be completing the installation.

“We apologise for the inconvenience while we carry out these works but we are trying to keep disruption to an absolute minimum.”