From a CNW Group press release seen on Yahoo! Canada Finance:
GO Transit will operate a special event train for passengers to experience a unique tight-rope walk across Niagara Falls. Nik Wallenda will attempt to cross the natural wonder on an 1,800-foot wire on the evening of Friday, June 15.
GO will run a train from Union Station at 3:30 p.m. to arrive in Niagara Falls at 5:34; events around the Falls are due to begin in the early evening. Following the event, the return trip will leave Niagara Falls at 12:01 a.m. and arrive in Toronto at 2:04.