Big Sky Rail (reporting mark BGS) was formed in 2011 to service Saskatchewan grain producers. It is a subsidiary of Mobil Grain and a sister railway to the Last Mountain Railway.
Big Sky Rail interchanges with CN at Delisle and has running rights into the CN Chappell Yard in Saskatoon.
Big Sky Rail operates three subdivisions:
- The former CN Conquest subdivision
- The former CN Elrose subdivision
- The former CN Matador subdivision