 1852 map showing the O&A | |
 The engine "Firefly" on a trestle of the Orange and Alexandria Railroad. | |
| Overview | |
|---|---|
| Locale | Virginia |
| Dates of operation | 1848–1867 |
| Successor | Orange, Alexandria and Manassas Railroad |
| Technical | |
| Track gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
| Previous gauge | Originally built as 4 ft 8 in (1,422 mm) |
The Orange and Alexandria Railroad (O&A) was a railroad in Virginia, United States. Chartered in 1848, it eventually extended from Alexandria to Gordonsville, with another section from Charlottesville to Lynchburg. The road played a crucial role in the American Civil War, saw the first of many mergers in 1867, and eventually became an important part of the modern-day Norfolk Southern rail system.