Another summer weekend, another major subway closure.

TTC officials warned riders Tuesday that the Yonge line, south of Bloor St., will be shut down this weekend.

And subway service between Bloor Station and St. George Station will also grind to a halt Saturday and Sunday so crews can undertake “major work” on the signal system on the Yonge-University-Spadina line.

During the shutdown, trains on the University-Spadina line will be turning back north at St. George Station while trains on the Yonge line will turn back at Bloor.

The TTC will be running shuttle buses every three minutes between Bloor and St. George station.

Subway service should be back to normal by 6 a.m. Monday.

don.peat@sunmedia.ca