| State/territory | Railway |
| Alabama | |
| Arizona | |
| Arkansas | |
| California | |
| Colorado | |
| Connecticut | |
| Florida | |
| Georgia | |
| Illinois | |
| Indiana | - Hesston Steam Museum (dual-gauge lines with 3 ft (914 mm) gauge track also present) (separate 14 in (356 mm) gauge railway and separate 7+1⁄2 in (190.5 mm) gauge railway also present) (operating)
|
| Kentucky | |
| Louisiana | |
| Maine | |
| Massachusetts | |
| Michigan | - Tauber Family Railroad (located in Detroit Zoo) (operating)
- Toonerville Trolley[2] in Soo Junction (operating)
|
| Minnesota | - Lake Region Threshers Show Dalton MN (600 mm / 1 ft 11+5⁄8 in gauge) (operating)[3]
|
| Missouri | |
| Nebraska | |
| Nevada | |
| New Hampshire | |
| New Jersey | |
| New Mexico | |
| New York | |
| North Carolina | |
| Ohio | - J&L Narrow Gauge Railroad[7] (located in Youngstown Steel Heritage) (operating)
|
| Oregon | |
| Pennsylvania | |
| Texas | |
| Utah | - Bingham Central Railway (defunct)[10]
- S&S Shortline Railroad Park & Museum[11] (separate 7+1⁄2 in (190.5 mm) gauge railway also present) (operating)
- Wild Kingdom Train (located in Lagoon) (separate 2 ft (610 mm) gauge railway named Pioneer Village Railroad and two separate 12 in (305 mm) gauge railways, the more recent one being named Lagoon Miniature Railway, previously present) (operating)
|
| Virginia | |
| Washington | |