Line 4 Sheppard: There will be no subway service between Sheppard-Yonge and Don Mills stations, starting 11:59 p.m., nightly Monday, July 27 to Friday, July 31, due to planned track work. Shuttle buses will operate. Started Fri Jul 24 Until Fri Jul 31 (Updated Fri Jul 24 )Line 4 Sheppard: Delays eastbound from Sheppard-Yonge to Bayview stations while we fix a signal problem. Started (Updated ) Customers may experience delays of approximately five minutes.