The M&B Railroad (reporting mark MNBR), formerly the Meridian and Bigbee Railroad, is a Class III railroad that operates 189 miles of railroad from Meridian, Mississippi eastward to Burkeville, Alabama. Additionally, the M&B has trackage rights over CSX from Burkeville to Montgomery, Alabama.
The M&B is owned by Genesee and Wyoming Inc. After Hurricane Katrina, it served as a run-through bridge route for CSX to connect with the Kansas City Southern at Meridian, thereby avoiding interchange at New Orleans.
http://en.wikipedia.org/wiki/M%26B_Railroad