A full service will not be restored on the troubled Northern Line until Wednesday, according to London Underground (LU).
Travellers have been walking or taking the bus instead of the Tube
All trains have been suspended since Wednesday night after drivers walked out in a row over the emergency brakes.
LU said a limited service would resume on the Edgware branch from 1700 BST on Saturday, and would be extended as the 106-strong fleet of trains was fixed.
Only a limited service will operate during the morning peak on Monday.
In the meantime, travellers are being advised to use buses laid on to provide replacement services.
Drivers refused to work on the Northern Line, which serves 660,000 people every weekday, because of a series of failures of the emergency brakes, which stop the train if it runs through a red signal.
Mike Brown, LU Chief Operating Officer, said: "We needed to ensure that trains were 100% safe to operate before we recommenced services.
"The suspension of Northern Line services has caused considerable disruption to passengers and it was essential that services were restored as quickly as possible."
He said on Friday that extensive tests were carried out on 10 trains with a modified component and there were no problems with the emergency braking system.
London Underground (LU) used emergency powers to oversee modifications of the trains by Tube Lines and its sub contractor Alstom.
The two maintenance firms will now carry out the modifications at a rate of one train every hour in order to get the service back up and running by Wednesday.
The problems on the line have prompted calls to bring Tube maintenance back "in house" - it was privatised under the controversial PPP scheme two years ago.