6/19/2023 0 Comments Travel from the power hourCars in a curve require a good deal of tractive effort because the wheels are mounted on solid axles. The second factor to consider is track curvature. At speeds above 30 to 40 miles per hour, air resistance becomes significant but since this depends on the aerodynamics of specific trains, it is not addressed here. ![]() Today, with all roller bearing journals, this is not much of a consideration. Years ago, the initial starting requirements were much higher when cars had friction bearings. ![]() This force is required to overcome bearing friction, rail deflection, minor flange contact, etc. At very slow yard speeds only 2 to 3 pounds is needed while increasing to about 5 pounds at higher speeds. First, a force of 2 to 5 pounds per ton of train weight is required to move on straight level track. The tractive effort required to move a train consists of numerous factors, but for most applications only four need to be considered. ![]() Locomotive Tractive Effort and Power Calculations TRACTIVE EFFORT CALCULATIONS
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