About 750 Canadian National Railway employees are threatening to strike beginning on Saturday.
The company announced Wednesday that it received a 72-hour strike notice from the International Brotherhood of Electrical Workers.
Wages and benefits are two of the main issues.
CN remains optimistic that an agreement can be reached without a labour disruption.
However, should the union move forward with a strike, CN says it has prepared and is ready to implement an operational contingency plan, which "would ensure a normal level of continued safe operations as long as required".