Patent ID: 6970774

Claim:
A system for correcting errors in train movement information caused by wear of a wheel of a train, the system comprising: a control unit; a memory connected to the control unit; a positioning system in communication with the control unit, the positioning system being configured to provide the control unit with position information pertaining to the train; and a wheel sensor connected to the control unit, the wheel sensor being configured to measure rotation of a train wheel; wherein the control unit is configured to perform the steps of determining a distance traveled by the train over an interval by calculating a difference in positions reported by the positioning system at the start of the interval and the end of the interval; obtaining wheel rotation information from the wheel sensor over the interval; determining a new size of the wheel based on the distance traveled and wheel rotation information; calculating a correction factor based on the new wheel size and a nominal wheel size; and correcting train movement information indicated by the wheel sensor using the correction factor.