Definition of "non-smoking"

A recent public-opinion poll in local trains to and from representative large cities showed 52 per cent of passengers to prefer travel in non-smoking and 38 per cent in smoking accommodation, whilst 10 per cent expressed indifference. The percentage varied considerably according to the region; in the Karlsruhe area 60 per cent preferred non-smoking accommodation and only 27 per cent preferred to smoke.

1964 March, “Beyond the Channel: Western Germany: More non-smoking accommodation”, in Modern Railways, page 205

It amused me, by the way, when I was told on the Jacobite steam service in Scotland that "this is a non-smoking train". I was looking up at the sky and saw a quarter-mile-long duvet of steam and smoke that the locomotive had laid there.

2022 February 23, Benedict le Vay, “Part of rail's past... present... and future”, in RAIL, number 951, page 54