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Mind the gap


NCE readers correctly identify a vibration problem on curves, which in 1948 in the Permanent Way department was recorded as 'hunting' (Letters 8 March).

The lateral oscillation of a carriage was produced by load transference between the front and rear bogeys due to soft and hard spots in the ballast under the sleepers.

With a reduced gap, this action may be signicant in jumping a facing point and placing additional forces on tie bars. Daily vigilance on facing points seems advisable in those circumstances.

Steven Revess (F), SR Design Associates, 15 Kempsford Gardens, London SW5 9LA

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