It is hoped the Midland Metro tram service will fully reopen over the weekend, managers said.
Three stops, from Birmingham Snow Hill to the Jewellery Quarter stop, have been closed since Wednesday lunchtime after an overhead wire fell.
The operator, National Express, ruled out foul play. The firm said it was working hard to resolve the issue and apologised for the inconvenience.
There are 23 stops when the Metro is operating normally.
It is currently running from Wolverhampton St George's to Soho, Benson Road.
National Express said engineers would be working overnight on Friday.
It was unsure exactly when the Metro would fully reopen, but said people could go on its bus network using Metro passes and these could also be used on London Midland trains.
The 10th anniversary of the Metro was celebrated in May.