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| | Engineering in New Zealand - North Island |
 | | This centre rail is in profile like a dumb-bell - similar, that is to say, to a track rail of the type used in Great Britain, apart from the fact that the head and foot are equal in size - but it is laid on its side, instead of in the vertical position. |
 | | The purpose of the centre rail is to provide for additional adhesion, and the Fell locomotives, in addition to their ordinary driving wheels, are provided underneath, with a pair of horizontal driving wheels, one on either side of the centre rail. |
 | | During this idle period, however, the bore was not entirely without use, for horsemen and pack horses made a practice of passing through it on their way to the King Country, running the risk of getting "bogged" in the stiff clay somewhere in the middle of this fl hole in the hills. |
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