Starting today, Metrolinx says the doors on all GO Trains will close one minute before their scheduled departure time.
The Crown transit agency says the change has been made to ensure trains leave and arrive to and from stops on time.
Metrolinx says all GO Trains will be impacted by the new change, but GO buses and the U-P Express train will operate as normal.
The agency says it will closely monitor commuter feedback on what they think of the doors closing earlier.