When couplers are not under tension, they can easily be disengaged by the upward pressure of the uncoupling ramp. The uncoupling ramp always exerts an upward pressure, because it is fitted underneath with a metal spring.
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Plate 96: An uncoupling operation over an uncoupling ramp
(This plate added OCT 2003)
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In this view, the "Flying Scotsman" train has been backed toward the right and then stopped. The couplers of the cars
that are positioned over the ramp have automatically disengaged. Uncoupling occurs because when cars are
pushed by a locomotive during a backing operation, the pulling tension in the couplers is relieved.
When couplers are not under tension, they can easily be disengaged by the upward pressure of the uncoupling ramp. The uncoupling ramp always exerts an upward pressure, because it is fitted underneath with a metal spring. |
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