| 21. | The S class also showed American design influence in its use of a delta trailing truck and bar frames rather than plate frames.
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| 22. | In 1927, class leader N 110 was equipped with a two-cylinder Franklin booster engine which drove the trailing truck axle.
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| 23. | The springs of the coupled axles and trailing truck are mounted above the axle boxes and are mutually joined by means of rockers.
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| 24. | The solution was to convert the entire class to use 2 axle leading and trailing trucks to better guide the locomotive around curves.
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| 25. | They were poor performers at low speed and the presence of a booster engine on the trailing truck was an absolute necessity for starting.
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| 26. | All were fitted with driving wheels, two cylinders, and cast-steel KW pattern trailing trucks, similar to those fitted to pilot.
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| 27. | Finally, about 1921 the Delta trailing truck was developed with an inverted-rocker centering device at the rear ends of the truck frame.
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| 28. | Other parts of the surplus North Island JA were also refited, including the trailing trucks and approval was given to fit JA 1288 boiler.
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| 29. | In October 1913 Billinton ordered the design of an enlarged version of the J class tank, with the trailing truck replaced by a bogie.
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| 30. | The axle load weights as shown for the Class 19B are with the trailing truck compensating beam pin in the rearmost of the three holes.
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