Taking stock

By Barry Fox Railway freight wagons are a prime target for thieves, so some have tracer beacons that allow them to be tracked. But infrequent servicing means these batteries often go flat. Now the Sema Group in Britain has a solution. A transmitter on the locomotive sends out a “token”, a weak radio signal that’s bounced down the train’s wagons. When wagon 1 receives the token, it retransmits it as token 2, which wagon 2 uses to generate token 3 and so on, down to the last wagon,
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