Canada's 2 biggest freight railroads have been shut down, and it could impact everything from autos to energy in the US

• Canada's rail freight has halted as two major rail companies locked out 10,000 union members.
• The stoppage follows failed contract negotiations, with workers demanding better wages and conditions.
• The disruption could cost Canada $251 million daily and impact US industries.

Canada's rail freight came to a halt early Thursday after Canadian National and Canadian Pacific Kansas City locked out nearly 10,000 union members.