| Year | Change |
| 1901 | Dayton, Springfield and Urbana opens line between Buck Creek Bridge (Springfield) and Urbana on March 3, 1901. Service to downtown Springfield starts in May 1901. |
| 1901 | Columbus, London and Springfield opens line between Springfield and Columbus on July 1, 1901. |
| 1901 | Miamisburg and Germantown Traction Company opens line between Miamisburg and Germantown on July 1, 1901. |
| 1901 | Dayton and Northern Traction Company opens line between Dayton and Greenville on October 11, 1901. |
| 1901 | Dayton and Troy Electric Railway Company opens line between Dayton and Troy in December 1901. |
| 1901 | Dayton, Springfield and Urbana opens line between Medway and New Carlisle. |
