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2. Wickham trolley - Wikipedia

   en.wikipedia.org/wiki/Wickham_trolley

   Standard gauge Wickham Trolley, at Locomotion museum, Shildon. The Wickham trolley was a railway engineering personnel carrier built by D. Wickham & Co of Ware, Hertfordshire. This long established firm introduced their rail trolley in 1922 as a lightweight track inspection and maintenance vehicle.

3. Grease fitting - Wikipedia

   en.wikipedia.org/wiki/Grease_fitting

   Grease fitting on a bearing A grease nipple on the driver's door of a 1956 VW Beetle. A grease fitting, grease nipple, Zerk fitting, grease zerk, or Alemite fitting is a metal fitting used in mechanical systems to feed lubricants, usually lubricating grease, into a bearing under moderate to high pressure using a grease gun.

4. Rolling resistance - Wikipedia

   en.wikipedia.org/wiki/Rolling_resistance

   Wheel bearing rolling resistance is lowest with high axle loads and intermediate speeds of 60–80 km/h with a Crr of 0.00013 (axle load of 21 tonnes). For empty freight cars with axle loads of 5.5 tonnes, Crr goes up to 0.00020 at 60 km/h but at a low speed of 20 km/h it increases to 0.00024 and at a high speed (for freight trains) of 120 km/h ...

5. False brinelling - Wikipedia

   en.wikipedia.org/wiki/False_brinelling

   False brinelling. False brinelling of a bearing. False brinelling is a bearing damage caused by fretting, with or without corrosion, [1] that causes imprints that look similar to brinelling, but are caused by a different mechanism. False brinelling may occur in bearings which act under small oscillations [2] or vibrations.

6. Semi-trailer - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer

   Semi-trailer. A tractor unit pulling a semi-trailer. A truck pulling a semitrailer using a trailer dolly. A semi-trailer is a trailer without a front axle. The combination of a semi-trailer and a tractor truck is called a semi-trailer truck (also known simply as a "semi-trailer", "tractor trailer", or "semi" in the United States). [1]

7. Race (bearing) - Wikipedia

   en.wikipedia.org/wiki/Race_(bearing)

   In the case of ball bearings, the bearing has inner and outer races and a set of balls. Each race is a ring with a groove where the balls rest. The groove is usually shaped so the ball is a slightly loose fit in the groove. Thus, in principle, the ball contacts each race at a single point.