Green signals
07 May 2012
NEW ZEALAND: KiwiRail has installed a small
hydroelectric plant and solar panels to power signals and lighting at the
Tiroroa passing loop. The equipment replaces two diesel generators. These
started automatically as a train approached, but the isolated site is only
accessible by rail and KiwiRail wanted an alternative to sending staff on
time-consuming trips to replenish the fuel every two weeks. Two sources of
power are combined, as there is not a sufficiently constant flow of water or
stream of sunlight to rely on one.
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