GO Transit has suspended train service on the Lakeshore East line, east of Pickering station, because of a fuel spill overnight.
Shuttle buses will be available for commuters travelling between Ajax, Whitby and Oshawa.
Late Friday night, a train became disabled after it hit some debris on the track and it's fuel tank was ruptured.
The incident caused a fuel leak.
More than 100 passengers were on board the train, but no one was hurt.
Crews have been cleaning up the spill.