running in

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English

Noun

running in (uncountable)

  1. The operating of a new engine (especially that of a motor vehicle) at less than its normal speed until proper working has been established.
    • 1945 July and August, “The Why and The Wherefore: L.N.E.R. Pacifics at Cambridge”, in Railway Magazine, page 242:
      For years past Pacific locomotives of all classes have worked between Kings Cross and Cambridge, both in order usefully to fill in gaps in their long-distance rosters, and also for running-in purposes after overhaul. Before the war the 7.18 a.m. slow from Kings Cross to Cambridge was a regular running-in turn for express locomotives stationed at Kings Cross shed.
    • 1960 June, “British cars go by rail: I-The L.M.R. wins new Anglo-Scottish traffic”, in Trains Illustrated, page 335:
      moreover, there are times of pressure when, to expedite deliveries, cars may be driven in what should otherwise be the running-in period at speeds that do them no good - and over long distances too.

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