The Transportation Safety Board of Canada says lead investigators Robert Johnston and Dan Di Tota will give the update starting at 11 a.m. ET in Ottawa.
Five passengers and the driver of OC Transpo bus 8017 died after the bus collided with Via Rail passenger train No. 51 on the morning of Sept. 18, 2013.
The collision at a level crossing near Fallowfield Station, in the south Ottawa community of Barrhaven, also injured dozens of bus passengers.