1. Airflow Science Corporation, 2006. Aerodynamic Subroutine Version 4.0. Association of American Railroads, Washington, DC.
2. American Railway Engineering and Maintenance-of-Way Association (AREMA), 2001. Manual for Railway Engineering, Chapter 16, Part 2, Train performance. American Railway Engineering and Maintenance-of-Way Association, Landover, MD.
3. The Railroad: What It Is, What It Does;Armstrong,1998
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