From 8 p.m. on Friday, October 23 until 10 p.m. on Sunday, October 25 and again from midnight until 6 p.m. on Saturday, October 31, GO Transit is closing the west end of the platform at Ajax Station as part of the ongoing project to build a tunnel at the station.
GO is restricting access to trains during these times and train crews will only open the doors on the five east-end cars of the train (that means: the first five cars closest to the engine) for passengers to board and exit the trains.