Metro services between Sunderland and Tyneside are set to resume on Thursday morning.
Services between Pelaw and South Hylton have been suspended since overhead cables came down on Sunday night.
Network Rail, which owns and manages the line, has drafted in extra resources to bring the reopening of forward by 24 hours.
Repairs will start at 9pm tonight and continue throughout Wednesday and Network Rail says the line will reopen from 5.20am on Thursday.
Metro trains will be able to run a shuttle service between South Hylton and Park Lane on Wednesday.
The works will mean that Northern Rail services will not be running between Newcastle and Sunderland all day tomorrowr. Northern Rail will be running a replacement bus service between Newcastle and Sunderland. Real time journey information can be found by visiting www.journeycheck.com/northernrail
The last services to operate this evening will be the 21.10 Middlesbrough – Hexham (Divert via Eaglescliffe) and 21.18 Newcastle – Middlesbrough (Divert via East Coast Mainline)
Head of Customer Services and Communications at passenger transport executive Nexus, Huw Lewis, said: “We are expecting to resume Metro services between Pelaw and South Hylton from the first train on Thursday morning.
“We understand the level of inconvenience this has caused to our customers since the overhead line came down on Sunday night following Storm Desmond.
"We have pressed Network Rail to accelerate the repair work and we are pleased that it will now mean that we can re-start on Thursday instead of Friday.”
Until the line re-opens on Thursday a replacement bus service, 900, will continue to operate between Heworth and Sunderland. This is expected to be very busy and passengers should allow extra time for their journey. A second bus, Route 901, is operating between Sunderland and South Hylton. These are seven seater taxis.
Metro tickets are also being accepted on local bus services in the affected area. Ticket acceptance on Go North East services 9, 35, 36; Stagecoach services 8, 11, 20 and service 558 operated by Gateshead Central Taxis.