| 1. | The axle or axles of the leading wheels are normally located on a leading truck.
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| 2. | Innovations in steam locomotive design included the introduction of compound engines and bogie rather than axle leading wheels.
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| 3. | Two step reductor was used as a power transmission from a traction motor to the leading wheel pair.
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| 4. | Originally the 141 Class had leading wheels of diameter, coupled wheels of diameter, and cylinders measuring.
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| 5. | Leading wheels are used to help the locomotive negotiate curves and to support the front portion of the boiler.
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| 6. | The 4-6-2 designation means it has 4 leading wheels, 6 driving wheels, and 2 trailing wheels.
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| 7. | The extra weight of the larger boilers was borne by the leading wheels, making the locomotives unstable, particularly at speed.
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| 8. | The drive was on the trailing wheels and the slide bars were attached to a motion bracket just behind the leading wheels.
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| 9. | Tyre wear was reduced by supplying jets of water, fed from diameter pipes, to the leading wheels while negotiating curves.
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| 10. | Tyre wear was reduced by supplying jets of water, fed from diameter pipes, to the leading wheels while rounding curves.
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