| Title | Wheel Unloading of Rail Vehicles Due to Track Twist |
|---|---|
| Record ID | 50575 |
| Personal Name Creator |
Jeong, David; Weinstock, H.; Greif, R. |
| Source | 58p. in various pagings |
| Corporate Creator | John A. Volpe National Transportation Systems Center (U.S.) |
| Corporate Contributor |
United States. Department of Transportation. Federal Railroad Administration |
| Publisher | United States. Department of Transportation. Federal Railroad Administration |
| Publication Date | 19860201 |
| Language | English |
| Abstract | An analysis is presented describing the effect that track twist has on the loads carried by the wheels of a rail car. Wheel unloading is determined as a function of the difference in crosslevel between the truck centers of the car. The different vehicle characteristics that affect a car's reaction to track twist are determined. It is found that light, torsionally stiff cars are the most susceptible to wheel unloading due to track twist. Using the results of a previous study where lateral wheel/rail force was determined as a function of curvature, the difference in crosslevel between truck centers that will cause Nadal's Limit for wheel climb to be exceeded is determined as a function of curvature. This difference in crosslevel between truck centers is normalized to 31 ft so that maximum track twist, as it is commonly defined, is determined as a function of curvature. It has been found that for less that 6 deg of curvature and at low speeds, most rail cars can withstand up to 1.5 in. of track twist in 31 ft. The amount of track twist that a car can withstand decreases with increasing curvature, and at 15 deg of curvature the amount of track twist that most railcars can withstand has dropped to 1.0 in. |
| Rosap ID | dot:11952 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/11952 |
| TRT Terms | Cross leveling; Curvature; Curved track; Deformation; Derailments; Railroad cars; Railroad tracks |
| Classification | AGR - INFRASTRUCTURE - INFRASTRUCTURE; AGR - INFRASTRUCTURE - Railroads; NTL - RAIL TRANSPORTATION - RAIL TRANSPORTATION; NTL - RAIL TRANSPORTATION - Rail Safety; NTL - SAFETY AND SECURITY - Vehicle Design; NTL - SAFETY AND SECURITY - SAFETY AND SECURITY; NTL - SAFETY AND SECURITY - Rail Safety |
| Geographical Coverage |
United States |
| Contract Number | RR519/R5305 |
| Report Number | DOT/FRA/ORD-85/14, DOT-TSC-FRA-84-7, |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/50000/50500/50575/DOT-TSC-FRA-84-7.pdf |
| Format | |
| Database | NTL Digital Repository |