| Railroad | Records | Links |
|---|
| Totals | 33,505 | 1,022 |
|---|
| Gainesville and Gulf Railway | 9 | |
| Gainesville, Jefferson and Southern Railroad | 3 | |
| Galena and Chicago Union Railroad | 35 | |
| Galesburg and Great Eastern Railroad | 4 | |
| Galeton, South Branch and Germania Railroad | 3 | |
| Galveston, Harrisburg and San Antonio Railway | 30 | 3 |
| Galveston, Houston and Henderson Railroad | 25 | |
| Galveston, Houston and Northern Railway | 12 | 1 |
| Genesee and Wyoming Railroad | 7 | |
| Georges Creek and Cumberland Railroad | 7 | |
| Georges Valley Railroad | 3 | |
| Georgetown and Western Railroad | 9 | |
| Georgia Eastern Railway | 7 | |
| Georgia Midland and Gulf Railroad | 6 | |
| Georgia Northern Railway | 7 | |
| Georgia Pacific Railway | 7 | 1 |
| Georgia Railroad | 32 | |
| Georgia Southern and Florida Railway | 19 | 1 |
| Georgia, Florida and Alabama Railway | 4 | |
| Gettysburg and Harrisburg Railway | 8 | |
| Gettysburg Railroad | 15 | |
| Gila Valley, Globe and Northern Railway | 4 | |
| Glade Creek and Raleigh Railroad | 6 | 1 |
| Glenfield and Western Railroad | 5 | |
| Glenn Springs Railroad | 4 | |
| Grafton and Brunswick Railroad | 4 | |
| Grafton and Upton Railroad | 4 | 1 |
| Grand French Railroad | | 1 |
| Grand Gulf and Port Gibson Railroad | 14 | |
| Grand Rapids and Indiana Railway | 29 | |
| Grand Tower and Carbondale Railroad | 4 | |
| Grand Trunk Railway | 109 | 2 |
| Great Central Kentucky Railroad | 11 | |
| Great Eastern Railway | 5 | |
| Great Falls and Canada Railway | 10 | |
| Great Falls and Conway Railroad | 9 | |
| Great Northern Railway Line | 43 | 1 |
| Great Northern Railway of Canada | 15 | |
| Great Western Illinois Railroad | 19 | |
| Green Bay and Minnesota Railroad | 4 | |
| Green Bay and Western Railroad | 10 | |
| Green Bay, Milwaukee and Chicago Railroad | 10 | |
| Green Bay, Winona and St Paul Railroad | 8 | |
| Greenville and Columbia Railroad | 51 | |
| Greenville and Miami Railroad | 14 | |
| Greenwich and Johnsonville Railway | 13 | |
| GreigsvilIe and Pearl Creek Railroad | 3 | |
| Gulf and Brazos Valley Railroad | 2 | |
| Gulf and Chicago Railroad | 10 | |
| Gulf and Interstate Railway of Texas | 4 | |
| Gulf and Ship Island Railroad | 15 | |
| Gulf Shore Railway | 6 | |
| Gulf Western Texas and Pacific Railway | 5 | |
| Gulf, Beaumont and Kansas City Railroad | 11 | |
| Gulf, Colorado and Santa Fe Railway | 130 | 6 |
| Gunpowder Valley Railroad | 2 | |
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