| Numerical Key to Black's Railroad Maps | |
| Number | Railroad |
| 1 | Baltimore & Ohio (not on this site) |
| 2 | Alexandria, Loudoun & Hampshire |
| 3 | Orange & Alexandria |
| 4 | Winchester & Potomac |
| 5 | Virginia Central |
| 6 | Richmond, Fredericksburg & Potomac |
| 7 | Richmond & York River |
| 8 | Richmond & Petersburg |
| 9 | Richmond & Danville |
| 10 | South Side |
| 11 | Norfolk & Petersburg |
| 12 | Petersburg |
| 13 | Seaboard & Roanoke |
| 14 | Virginia & Tennessee |
| 15 | Piedmont |
| 16 | Raleigh & Gaston |
| 17 | Roanoke Valley |
| 18 | Wilmington & Weldon |
| 19 | Atlantic & North Carolina |
| 20 | North Carolina |
| 21 | Western North Carolina |
| 22 | Western |
| 23 | Atlantic, Tennessee & Ohio |
| 24 | Wilmington, Charlotte & Rutherford |
| 25 | Wilmington & Manchester |
| 26 | Cheraw & Darlington |
| 27 | Charlotte & South Carolina |
| 28 | King's Mountain |
| 29 | South Carolina |
| 30 | Greenville & Columbia |
| 31 | Spartanburg & Union |
| 32 | Laurens |
| 33 | Blue Ridge |
| 34 | Northeastern |
| 35 | Charleston & Savannah |
| 36 | Georgia |
| 37 | Augusta & Milledgeville |
| 38 | Western & Atlantic |
| 39 | Etowah |
| 40 | Rome |
| 41 | Central Railroad (of Georgia) |
| 42 | Macon & Western |
| 43 | Upson County |
| 44 | Macon & Brunswick |
| 45 | South Western |
| 46 | Muscogee |
| 47 | Augusta & Savannah |
| 48 | Savannah, Albany & Gulf |
| 49 | Atlantic & Gulf |
| 50 | Brunswick & Albany |
| 50 | Brunswick & Florida |
| 51 | Atlanta & West Point |
| 52 | Florida, Atlantic & Gulf Central |
| 53 | Florida |
| 54 | Pensacola & Georgia |
| 55 | Tallahassee |
| 56 | Alabama & Florida of Florida |
| 57 | Alabama & Florida of Alabama |
| 58 | Montgomery & Eufaula |
| 59 | Montgomery & West Point |
| 60 | Tuskegee |
| 61 | Mobile & Girard |
| 62 | Mobile & Great Northern |
| 63 | Spring Hill (Mobile & Spring Hill) |
| 64 | Mobile & Ohio |
| 65 | Mississippi, Gainesville & Tuscaloosa |
| 66 | Memphis & Charleston |
| 67 | Wills Valley |
| 68 | Nashville & Chattanooga |
| 69 | Winchester & Alabama |
| 70 | McMinnville & Manchester |
| 71 | Tennessee & Alabama |
| 72 | Nashville & Northwestern |
| 73 | Louisville & Nashville |
| 74 | Memphis, Clarksville & Louisville |
| 75 | Edgefield & Kentucky |
| 76 | East Tennessee & Georgia |
| 77 | East Tennessee & Virginia |
| 78 | Knoxville & Kentucky |
| 79 | Rogersville & Jefferson |
| 80 | Memphis & Ohio |
| 81 | Northeast & Southwest |
| 82 | Alabama & Mississippi Rivers |
| 83 | Cahaba, Marion & Greensboro |
| 84 | New Orleans & Ohio |
| 85 | Mississippi Central |
| 86 | Mississippi & Tennessee |
| 87 | Memphis & Little Rock |
| 88 | New Orleans, Jackson & Great Northern |
| 89 | Southern Railroad of Mississippi |
| 90 | Raymond |
| 91 | Jefferson & Lake Pontchartrain |
| 92 | Pontchartrain |
| 93 | Mexican Gulf |
| 94 | New Orleans, Opelousas & Great Western |
| 95 | West Feliciana |
| 96 | Clinton & Port Hudson |
| 97 | Baton Rouge, Grosse Tete & Opelousas |
| 98 | Vicksburg, Shreveport & Texas |
| 99 | Alexandria & Cheneyville (Red River) |
| 100 | Texas & New Orleans |
| 101 | Eastern Texas |
| 102 | Buffalo Bayou, Brazos & Colorado |
| 103 | Houston Tap & Brazoria |
| 104 | Galveston, Houston & Henderson |
| 105 | Houston & Texas Central |
| 106 | Washington County |
| 107 | San Antonio & Mexican Gulf |
| 108 | Memphis, El Paso & Pacific |
| 109 | Southern Pacific |
| 110 | Manassas Gap |
| 111 | Alabama & Tennessee River |
| 112 | Hungary Branch |
| 113 | Grand Gulf & Port Gibson |