| 21. | The truck also has its original drive axle, bearings, seals, gears, tie rods and injectors.
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| 22. | They weighed 46.6 tons in working order, with 36.7 tons carried by the two driving axles.
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| 23. | The most common tractor-cab layout has a forward engine, one steering axle, and two drive axles.
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| 24. | On locomotives which had the driving axle in front of the firebox, adhesive weight was increased.
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| 25. | The 4-2-2 locomotive had one single driving axle.
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| 26. | Its single speed, front-wheel-drive axle propelled it in a glide over hill and dale through Harvard.
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| 27. | The experimental AA20 4-14-4 locomotive was the only one ever to have seven coupled driving axles.
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| 28. | Two drive axles had a lower reciprocating mass than three, four, five or six coupled axles.
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| 29. | Both of these examples used vertical cylinders, with the crankshaft in the plane of the driving axles.
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| 30. | The pistons powered a single driving axle at the rear of the locomotive, just behind the firebox.
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