| G. C. Holston Lumber Company tram road | 1920s |
| G. C. Williams | 1906 to 1909 |
| Galveston, Beaumont & Northeastern Ry. Co. | 1906 to about 1928 |
| Garrison Lumber Company | Unknown |
| Garrison-Norton Timber Company | 1907 to 1909 |
| Gate City Lumber Company | 1886 |
| Gebhart, Williams, Fenet & Co tram road | 1911 |
| Gerhart Lumber Company | |
| Gilmer Lumber Company tram road at Lemonville | ca. 1890 to 1928 |
| Gilmer Lumber Company tram road at Remlig | ca. 1906 to 1925 |
| Grand Lake Lumber Company | 1928 |
| Grayburg Tie and Timber Company | |
| Great Sweetgum, Yubadam, & Hoo Hoo Route | 1885 to 1900 |
| Grogan Lumber Company tram road at Gladstell | 1915 to 1930 |
| Grogan's tram road | 1897 to about 1910 |
| Grogan-Cochran Lumber Company | 1900 to 1940 |
| Groveton, Kickapoo & Gulf Railroad Company | 1890 |
| Groveton, Lufkin, & Northern Railway Company | 1890 to 1932 |
| Gulf & Northern Railway Company | 1917 to 1944 |
| Gulf & Pacific | Ca.1893 to the 1930s. |
| Gulf Beaumont & Kansas City | 1893- ca. 1900 |
| Gulf, Colorado, & Santa Fe Railroad | |
| Gulf, Sabine, & Red River Railway
Louisiana | 1880 to 1930 |
| Gulf, Texas and Northern | |