There are possible delays on the Metrolink in Manchester between St Werburghs Road and Shaw and Crompton, between Droylsden and Bury and between Piccadilly and Bury due to signal failure and earlier points failure.
Metrolink, which runs Greater Manchester's trams, says the first service between Manchester Victoria and Oldham Mumps station will run on Wednesday, June 13.
It will run every 12 minutes, stopping at seven stations along the route.
The first service will leave Victoria at 5.24am.
It will take around 25 minutes to reach Oldham Mumps and will start the return journey at 6am.
Cllr Andrew Fender, Chair of the Transport for Greater Manchester Committee, said: "This is an historic day for Oldham and the Metrolink network.
"From next week, people will be able to make brand new journeys from brand new stops on brand new trams and tracks.
"For the first time, people will be able to travel to and from Monsall, Central Park, South Chadderton and Freehold on this line, so we are opening up new and exciting opportunities.
"Of course, Oldham is a brand new destination for Metrolink and I encourage everyone to take a tram ride to see all the great things the borough has to offer."