1907-1913 - Goshen South Bend & Chicago Railroad Co. (Woodville-La Porte)
1913-1917 - Gary & Interurban Railroad Co.
1910-1913 - Valparaiso & Northern Railway (Valparaiso-Chesterton)
1913-1917 - Gary & Interurban Railroad Co.
1917-1925 - Gary & Valparaiso Railway Co.
1925-1938 - Gary Railways Co.
1912-1913 - Gary Connecting Railways Co. (Gary-Woodville)
1913-1917 - Gary & Interurban Railroad Co.
1917-1925 - Gary & Connecting Railroad
1925-1938 - Gary Railways Co.
1914-1917 - Gary Hobart & Eastern Traction Co. (Gary-Hobart)
1917-1925 - Gary & Hobart Traction Co.
1925-1939 - Gary Railways Co.
1912-1928 - Gary & Southern Traction Co. (Gary-Crown Point)
1928-1933 - Gary Railways Co.
Interurban lines:
Gary-Woodville (1912-1938)
Valparaiso-Chesterton (1910-1938)
Woodville-La Porte (1907-1917)
Gary-Crown Point (1912-1933)
Gary-Hobart (1914-1939)
Replacement interurban bus service operated most years by Gary Railways Co.
1898-1899 - Elkhart Goshen & Southern Railway Co.
1899-1905 - Indiana Railway Co.
1903-1905 - Chicago & South Shore Railway Co. (Michigan City-La Porte)
1903-1905 - South Bend & Southern Michigan Railway Co. (South Bend-St. Joseph MI)
1905-1907 - Northern Indiana Railway Co.
1907-1930 - Chicago South Bend & Northern Indiana Railway Co.
1930-1940 - Northern Indiana Railway
Interurban lines:
Elkhart-Goshen (1898-1934)
Mishawaka-Elkhart (1899-1934)
Michigan City-La Porte (1903-1934)
La Porte-South Bend (1908-1934)
South Bend-St. Joseph MI (1903-1934)
Elkhart-Bristol (1910-1918)
Replacement interurban bus service operated most years by Northern Indiana Transit