| 21. | In turn, the circulating chain imparts a rotational motion to the drive wheels.
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| 22. | To improve curve running the wheel flanges of the driving wheels were reduced.
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| 23. | A generator is connected to the rotating drive wheels via an overdrive transmission.
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| 24. | The jackshaft was thus placed above and between the driving wheels.
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| 25. | Wootten instead mounted his huge firebox above the locomotive's driving wheels.
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| 26. | The number of driving wheels on locomotives varied quite a bit.
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| 27. | In the main, numbers were allocated in descending order of driving wheel diameter.
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| 28. | All five engines had cylinders with piston valves and retained their driving wheels.
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| 29. | The effective lifetime of the drive wheel tires is appropriately shortened.
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| 30. | This allowed use of relatively small driving wheels without sacrificing speed.
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