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2. Ball joint - Wikipedia

   en.wikipedia.org/wiki/Ball_joint

   [citation needed] Signs of a failing ball joint may start with a sudden burst sound as a result of ball joint dismantling. Then it keeps on with clicking, popping or snapping sound when the wheel is turned and eventually turn into a squeaking sound at the end of a stop, when the gas pedal is used and/or also when hitting bumps.

3. False brinelling - Wikipedia

   en.wikipedia.org/wiki/False_brinelling

   Surprisingly, however, vibration from the operating unit can cause bearing failure in the unit which is switched off. When that unit is turned on, the bearings may be noisy due to damage, and may fail completely within a few days or weeks [21] [22] even though the unit and its bearings are otherwise new. Common solutions include: keeping the ...

4. Hot box - Wikipedia

   en.wikipedia.org/wiki/Hot_box

   A hot box is the term used when an axle bearing overheats on a piece of railway rolling stock. [1] The term is derived from the journal-bearing trucks used before the mid-20th century. The axle bearings were housed in a box that used oil-soaked rags or cotton (collectively called "packing") to reduce the friction of the axle against the truck ...

5. Rail expert: 'The freight industry has become a mess' - AOL

   www.aol.com/finance/rail-expert-freight-industry...

   You know, the hot-box detectors to find failing wheel bearings are not regulated, and they're quite primitive,” Defazio said. “You should have vibration detectors, real-time vibration ...

6. Derailment - Wikipedia

   en.wikipedia.org/wiki/Derailment

   the primary mechanical failure of a component of the running gear of a vehicle (for example axlebox failure, wheel breakage) a fault in the geometry of the track components or the running gear that results in a quasi-static failure in running (for example rail climbing due to excessive wear of wheels or rails, earthworks slip)

7. Wheel hub assembly - Wikipedia

   en.wikipedia.org/wiki/Wheel_hub_assembly

   A roller bearing between the axle hub and axle shaft ensures easy rotation of the non-drive wheels. On the axle side, it is mounted to the holding bracket from the chassis; on the disc side, the wheel is mounted to the bolts of the WHA. When replacing, a wheel hub assembly should be torqued to the vehicle's specifications to prevent failure. [1]