A signal problem at Union Station on Line 1 caused “major delays,” affecting thousands of subway commuters Wednesday morning on the TTC.

Service was affected from St. Clair West to Finch stations, with trains holding at each station for about a minute before continuing.

“The signal is not giving the trains kind of like the green light to go ahead, so it would be unsafe to continue,” TTC spokesperson Kadeem Griffiths told the Star.

Regular service resumed at about 9:20 a.m.

The issue began after 7 a.m., with delays of up to 15 minutes southbound from Spadina to Union. Commuters reported much longer delays as the issue spread.

“There hasn’t been one in a while, but the system is quite old,” said Griffiths.

Margaryta Ignatenko is a breaking news reporter, working out of the Star's radio room in Toronto. Follow her on Twitter: @MargarytaIgnat1

Read more about: