Much of the Yonge-University-Spadina subway line will be shut down all weekend for track upgrades.

The line — now officially known as Line 1 — is closed from Yonge-Bloor Station all the way south and around to St. Andrew Station.

Shuttle buses are running, but anyone heading downtown should head south along the University side of the line.

The closure is to replace the aging signalling system. The TTC earlier today released a series of short videos via Vine of the work.