G - Physics – 01 – P
Patent
G - Physics
01
P
104/47, 73/0.5
G01P 21/02 (2006.01)
Patent
CA 1326964
-12- ABSTRACT There is a disclosed a railway system comprising a railway track; a railway vehicle (1) for travelling on the track, the vehicle having a tachometer (13) which produces pulses at a rate dependent on the speed of rotation of a wheel of the vehicle; and first and second beacons (C, B) adjacent the track and spaced apart along the track. The vehicle is provided with an arrangement comprising means for detecting automatically the first and second devices in response to the detecting means passing them, the distance between the point of detection of the first device and the point of detection of the second device being a known distance; means for deriving automatically a count representing the number of pulses from the tachometer between the points of detection; and means for comparing automatically said count with the number of pulses which should be derived from the tachometer for travel over said distance by a wheel of a nominal diameter, to produce a wheel diameter compensation value.
609261
Gowling Lafleur Henderson Llp
Westinghouse Brake And Signal Holdings Limited
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