Network Rail completed work to replace overhead wires at Brentwood during the bank holiday closure of the main line to London.
Engineers carried out the equivalent of 3,000 hours of work on Sunday 27 and Monday 28 August to replace 1km of overhead wire as part of a £250m project to upgrade the wiring system on the busy mainline.
The wires and structures that are currently in place were installed in the 1950s and the system is one of the oldest in the country.
A further 1,500 hours were spent installing structures at Ilford and Manor Park which will carry new overhead wires when they are installed next year.
Vital upgrades were also made between Shenfield and London Liverpool Street as part of the Crossrail programme, where over 200 metres of track was installed at Pudding Mill Lane near Stratford station to prepare for the connection of the Elizabeth line tunnel to the main line.
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