The lawyers acting for the 170 women who brought the original case against Birmingham City Council say this marks "an historic decision".
"This is a great day for equality and for all those women massively underpaid over many years within public and private organisations.
"Birmingham Council should now do the decent thing and settle the claims. They saved money by underpaying ex-workers for so many years, and so should now stop wasting taxpayers’ money fighting court cases they cannot win."
For more on this story see the ITV National News website.
More top news
Cloud will increase overnight, and becoming misty with drizzle later.
Dry during the evening, with broken cloud and some clear spells.
Midlands Matchday Live: Full time scores