Wongm's Rail Gallery » Track, rail and sleepers

Position of Train System (POTS) transponder located between the rails

In album: Track, rail and sleepers

There are around 650 units around the suburban network, located at major junctions as well as intermediate locations. When a train runs over the top, the antenna picks up the unique identifier, then transmits the data back to Metrol via radio, enabling them to know where a specific train set currently is.
Position of Train System (POTS) transponder located between the rails

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Taken with a Canon EOS 50D
Date: 10 August 2012 09:03 AM
Exposure Time: 1/160 sec
Aperture Value: f/6.3
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