Morgan Sindall will build a new £25m station at Haymarket, in Edinburgh, to create a fully accessible station as well as an integrated train, tram, bus and taxi transport hub.

Bam Nuttall will reconstruct or remove a number of structures around the central belt in a £27m project and Carillion will deliver a range of track alterations in the same region worth £3m.

Work will start on the three schemes Next Year and they form part of the £1bn EGIP scheme.

EGIP will also see the electrification of 350km of the existing rail network in the central belt, including the main Edinburgh Waverley-Glasgow Queen Street line, and provide opportunities to increase services and reduce journey times on routes between Alloa and Dunblane and Edinburgh and Glasgow.

Funded by Transport Scotland on behalf of the Scottish Government, the new infrastructure is being financed through Network Rail’s Regulatory Asset Base.

David Simpson, Network Rail route managing director for Scotland, said: “The track and bridgeworks contracts we have awarded also mean that preparations are well under way to deliver the electrification of rail lines in the central belt – which will cut journey times and increase capacity on key routes into Scotland’s two biggest cities.”

Morgan Sindall’s job will start on site in spring 2012.

Work will involve refurbishing the existing station building and constructing a new modern concourse to the west of the existing building.

The bridgeworks announced today will involve the reconstruction of 18 structures and the removal of two redundant bridges to prepare the way for the future electrification of the railway.