There will be a partial subway closure both Saturday and Sunday on Line 1 Yonge-University.
All trains will turn back southbound at St. Clair West station due TTC signal work being done between St. Clair and Downsview stations.
Replacement buses will be running during this time, with increased service on route 84 Sheppard West between Downsview and Sheppard-Yonge stations.
Extra service will also be made available on 32 Eglinton West, 52 Lawrence West, 109 Ranee and 512 St Clair.
Downsview, Wilson, Yorkdale, Lawrence West and Eglinton West stations will be open for connecting routes and fare purchases, but Glencairn station will be closed.