1. Should shortline railroads upgrade their systems to handle heavy axle load cars?;Babcock;Transportation Research Part E: Logistics and Transportation Review,2006
2. Modern railway track;Esveld,2001
3. Japanese studies on deterioration of ballasted track;Sato,1995
4. Vertical track loading;Frederick,1985
5. Ballast deformation and track deterioration;Shenton,1985