hammer blow

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English

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Noun

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hammer blow (plural hammer blows)

  1. A blow with a hammer.
  2. (rail transport) A pounding of the rails by the driving wheels of a steam locomotive caused by the inertia of unbalanced parts.
    • 1959 September, P. Ransome-Wallis, “The British Railways Class "9" 2-10-0s”, in Trains Illustrated, page 419:
      The balancing of the engine is unusual, with the rotating masses fully balanced and 40 per cent of the reciprocating masses statically balanced by lead weights in the coupled wheels; the reciprocrating balance weights are in the same phase on both sides of the engine. This system saves balance weight and reduces the wheel hammer-blow.

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