Late nights Monday, May 31 until Thursday, June 3, Line 1 Yonge - University subway trains in both directions operate along the southbound tracks only between Vaughan Metropolitan and Pioneer Village stations, while TTC crews repair a leak on the northbound tracks. Regular service resumes by 6 a.m. each morning.

(Since the single-track operation occurs after midnight each night, technically, the closure is from Tuesday, June 1 until Friday, June 4.)

During single-track operation, both south- and northbound trains alternate along the southbound tracks.

Passengers must board northbound trains on the southbound platforms at Highway 407 and Pioneer Village stations. You may also have to wait for trains longer than usually.