Work includes a new station in Edinburgh, bridgework and electrification of lines
Morgan Sindall, Bam Nuttall and Carillion have won £55m of work from Network Rail for improvements in the Edinburgh to Glasgow corridor.
Bam Nuttall is the biggest winner and will build 18 structures, mostly bridges, along the lines at a cost of £27m.
Morgan Sindall will build a new £25m station at Haymarket in Edinburgh, which will be fully integrated with the city’s tram and bus networks.
Meanwhile Carillion will conduct track alterations in the area worth £3m.
All the contracts form part of the Network Rail’s £1bn Edinburgh Glasgow Improvement Programme, which will see reduced journey times to the Scottish capital and Glasgow plus the electrification of 350km of existing rail lines.
Transport minister Keith Brown said: “This £50m investment for the Haymarket Station Capacity Project and electrification takes us one step closer to revolutionising the rail network in central Scotland.”