Quantcast Figure 3-11. Railcar harmonic rock and roll

 

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Train crews shall report any track locations that appear to create excessive forces
(bang or bounce the locomotive and railcars around). Sections of track that set up
harmonic rock and roll conditions shall be reported. Excessive rock and roll can lead
to wheel lift and possible derailment. Figure 3-11 shows the rocking motion that can
lead to a wheel lift derailment.
Figure 3-11. Railcar harmonic rock and roll.
Washouts and flooding. Anytime there is water over the track or heavy rains have
occurred since the last train operation, there is a potential for a washout. Track
underwater (water contacting the base of the rail) shall not be traversed before being
inspected by track maintenance personnel.
Loose or missing bolts at rail joints, uplifting or missing spikes, suspended or swinging
joints (joints which are not supported by at least one tie), and low joints.
Proper fit of switch points to the stock rail and correct tension.
Worn switch point protectors.
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