The vestibule ceilings are of three-ply, in removable sections to give access to the air-conditioning units, filters, and Pullman gangway control springs situated above.
Source: wiktionary
Three-ply
Synonyms for "three-ply" (15 found)
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Related words (7)
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2 total sentences available.
It has been found that although the two-ply moquette used in L.T. train upholstery was of equal weight to the three-ply fabric used in L.T. buses, the bus fabric had 50 per cent longer life, and accordingly it is now being used also for trains.
Source: wiktionary