METHOD AND SYSTEM PROVIDING SLEEP AND WAKE-UP MODES FOR RAILWAY TRACK CIRCUIT UNIT

摘要

A method provides sleep and wake-up modes for railway track circuit units. A n intermediate track circuit unit communicates in a first direction to a first unit and in a different second direction to a different second unit. A plurality of wireless messages are employed between a train and a plurality of wayside units operatively associated with some of the track circuit units. Included with the wireless messages are a first identifier of a correspondin g one of the track circuit units and a second identifier of a direction of travel of the train. One of the wireless messages is received at one of the wayside units corresponding to the intermediate unit based upon the first identifier. A signal is responsively output based upon the second identifier from the intermediate unit in the first direction to the first unit or in th e different second direction to the different second unit.