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Stations, Junctions, etc
Engine Sheds
Other
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Miscellaneous: Operating Equipment & Practices
Maintenance of the Permanent Way: misc_equip240
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Scan of the chart paper from a Hallade Recorder. The
instrument recorded the longitudinal, transverse and vertical movement and had
two external traces that were used to record the Whitewash drop (bottom) and
location marker (top). The speed and milepost numbers have been added
subsequently. The longitudinal movement can occur from a variety of causes,
including the application of brakes, so may not necessarily indicate an issue
with the track. The transverse movement is probably the most important when
looking for incorrect cant on the permanent way. When travelling around a curve
there will be an outward thrust which will vary depending upon the sharpness of
the curve and the speed of the train. Increasing the height of the outer rail
(cant) counter-acts this thrust and a perfectly adjusted rail will carry the
weight of train at the average speed equally on both the rails. The vertical
movement will be caused by slacks in the road, low or high joints, hanging
sleepers, or excessively sharp gradients.
Robert Ferris
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