After 1890 - Electric Light & Railway Department of Anaconda Copper Mining
1951 - streetcars discontinued
Billings
Battery Car
1912-1917 - Billings Traction Co.
1917 - battery cars discontinued
After 1917 - Billings Railway Light & Power Co.
1920's-1951 - Motor Transit Co.
After 1951 - Western Transit Co.
Bozeman
1892-1897 - Gallatin Light Power & Railway Co.
1897-1909 - Bozeman Street Railway Co.
1909-1910 - Gallatin Valley Electric Railway
1910-1918 - Gallatin Valley Railway
1918-1921 - Gallatin Valley Railway (CM&SP RR)
1921 - streetcars discontinued
Private bus co. in 1952 - City Bus Line
Kalispell
Private bus co. in 1952 - Kalispell Transportation Co.