Metrolinx says a major track circuit issue near Weston GO station disabled signalling for UP Express trains on Wednesday afternoon.
Passengers going from Union Station to Pearson airport had to take replacement GO buses from street level at the York UP Station downtown.
The daily email you need for
Toronto's top news stories.
Service to Weston and Bloor stations was cancelled during the outage.
The issue was resolved an hour later around 6:00 p.m.