As a vehicle traverses a curve, the vehicle transmits a centrifugal force to the rail at the
point of wheel contact. This force is a function of the severity of the curve, speed of
the vehicle and the mass (weight) of the vehicle. This force acts at the center of gravity
of the rail vehicle. This force is resisted by the track. If the vehicle is traveling fast
enough, it may derail due to rail rollover, the car rolling over or simply derailing from
the combined transverse force exceeding the limit allowed by rail-flange contact.