The firm will work on a £133m project to electrify the London Overground route from Gospel Oak to Barking.
The enabling works contract was awarded by Network Rail, working on behalf of Transport for London (TfL) and the Department for Transport (DfT).
The project will allow TfL to introduce new four-car trains along the route from January 2018, as well as creating an alternative route for rail freight traffic across north London.
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Murphy will work on the track, including track lowering of plan lines and switches as well as installing slab track.
In addition, the firm will reinforce embankments and cuttings, modify signals for 25kV AC electrification and telecommunication assets, and refurbish existing bridge parapets.
Further works include replacing an existing over-bridge, developing new platforms at Walthamstow station and installing electrification masts foundations along the line.
Murphy will work alongside project designers Amey and specialist contractor Stobart Rail.
Steve Hollingshead, Chief Executive, said: "This is a major rail infrastructure scheme and we are pleased to be working alongside Network Rail again on such a significant project – one that will have a positive impact on the thousands of passengers who use the route every day. The project also shows that Murphy is continuing to grow and build on its established reputation in the rail sector."
(LM/MH)
