| 摘要 |
A train detection mechanism for detecting the presence of a train on a section of track, the track section comprising first and second rails 1, 2 and delimited by first and second ends thereof, comprises current injection means for injecting current into the first rail at the first end of the section and means for receiving current from the second rail at the first end of the section, and a shunt 3 connected between the first and second rails at the second end of the section, characterised in that the shunt comprises a switch 4 for controlling current flow through said shunt, said switch being operable by the passage of a train.
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