Wiktionary

retention tank

English

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Noun

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retention tank (plural retention tanks)

  1. A tank for the retention of toilet waste, e.g. on a train.
    • 2020 January 2, “Fleet News”, in Rail, page 20:
      Eleven four-coach 'Castles' are on order, with eight delivered. These are former GWR Mk 3s that have been converted by fitting sliding doors, passenger information screens and retention tanks.
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