Teamsters Canada Rail Conference–Conductors, Trainpersons and Yardpersons (TCRC-CTY) represents approximately 3,000 CN train and yard operations employees. Last week, members of the union failed to ratify the tentative job agreement reached with CN in October 2013.
Since then, the two sides held two days of discussions before negotiations broke down, CN said in a press release.
"We plan to return to the table today with the assistance of federal mediators and will decide our next steps at the end of the day if we fail to reach an agreement with the union," said Jim Vena, CN executive vice-president and chief operating officer, on Wednesday.
The workers' last contract expired on July 22, 2013.