| Railroad | Records | Links |
|---|
| Totals | 26,537 | 978 |
|---|
| Kanawha and Coal River Railway | 1 | |
| Kanawha and Michigan Railway | 9 | 1 |
| Kanawha Railway | 2 | |
| Kanona and Prattsburgh Railway | 9 | |
| Kansas and Southern Railway | 4 | |
| Kansas and Texas Coal Railway | 3 | |
| Kansas City Belt Railway | 10 | |
| Kansas City Southern Railway | 30 | 3 |
| Kansas City, Fort Scott and Gulf Railroad | 18 | 2 |
| Kansas City, Fort Scott and Memphis Railroad | 25 | 2 |
| Kansas City, Fort Smith and Southern Railway | 8 | |
| Kansas City, Lawrence and Southern Kansas Railroad | 6 | 1 |
| Kansas City, Memphis and Birmingham Railroad | 5 | 1 |
| Kansas City, Mexico and Orient Railroad | 9 | |
| Kansas City, St Joseph and Council Bluffs Railroad | 28 | 4 |
| Kansas City, Watkins and Gulf Railway | 6 | |
| Kansas City, Wyandotte and Northwestern Railroad | 13 | |
| Kansas Pacific Railway | 31 | 2 |
| Kansas Southwestern Railway | 5 | |
| Kaslo and Slocan Railway | 5 | |
| Keating and Smethport Railroad | 2 | |
| Keeseville, Au Sable Chasm and Lake Champlain Railroad | 6 | |
| Kennebec and Portland Railroad | 21 | 3 |
| Kennebec Central Railroad | 10 | |
| Kentucky and Indiana Bridge and Railroad Company | 6 | |
| Kentucky Central Railroad | 23 | 4 |
| Keokuk and Western Railroad | 4 | |
| Keokuk, Fort Des Moines and Minnesota Railroad | 13 | |
| Keokuk, Mount Pleasant and Muscatine Railroad | 26 | |
| Kewaunee, Green Bay and Western Railroad | 9 | |
| Kings Mountain Railroad | 7 | |
| Kingston and Pembroke Railway | 18 | |
| Kinston and Carolina Railroad | 3 | |
| Kinzua and Tiona Railroad | 4 | |
| Kishacoquillas Valley Railroad | 8 | |
| Knoxville and Bristol Railway | 8 | |
| Knoxville and Kentucky Railroad | 12 | |
| Kymulga and Coosa River Railroad | 5 | |
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