1. Association of American Railroads (AAR), 2005. The importance of adequate rail investment. .
2. Association of American Railroads (AAR), 2008. Overview of America’s Freight Railroads. .
3. Railway timetabling using lagrangian relaxation;Brannlund;Transportation Science,1998
4. Estimating rail line capacity and delay by computer simulation;Bronzini;Transportation Forum,1985
5. Modeling and solving the train timetabling problem;Caprara;Operations Research,2002