The service, which is under study, would connect with existing and planned high speed rail corridors, and complement existing intercity and commuter railroad services.
Several attempts by Virginia state senator John S. Edwards to create an authority to manage the proposed line have died in the appropriations committee of the Virginia House after passing in the Senate in 2008.
While the creation of a dedicated authority failed in the Virginia legislature, in October 2009, the legislature approved subsidies to Amtrak to provide increased service on its Northeast Corridor service from Washington, DC to Lynchburg and Richmond. Ridership on the Lynchburg line from inception through the end of July 2010 exceeded 103,000 passengers, more than 250 percent the estimates for the first year of service.
TDX Routes and Stations
Transdominion Express would extend from Richmond west to Lynchburg and from Washington, DC (Alexandria) south via an existing Virginia Railway Express route to Manassas, extending on south to Charlottesville, Lynchburg, Roanoke and Bristol on the Tennessee border. 
The TDX service would potentially offer passenger connections with these rail services:
- Northeast Corridor (served by Amtrak's Acela Express and Regional services and many commuter railroads) at Washington, DC (Alexandria)
- Southeast High Speed Rail Corridor at Richmond
- Virginia Railway Express commuter railroad at Manassas, Virginia and Alexandria, Virginia
- MARC commuter railroad at Washington, DC
- Amtrak intercity services at Alexandria, Richmond, Charlottesville, Culpeper, Manassas, and Lynchburg, Virginia
- Richmond-Hampton Roads high speed corridor .
- Washington Metro Rapid Transit service at Alexandria, Virginia and Washington DC (Union Station)
- Goldstein, Blair (March 7, 2006). "Railroad bill nixed". The News & Advance.
- Reilly, Conor (March 4, 2007). "How did area bills fare?". The News & Advance.
- "SB 121 TransDominion Express Commission; created". Legislative Information System. Retrieved 2008-03-07.
- >"Taking the Train to the Next Level". The News & Advance. August 13, 2010.