Another vote here for the detachable elephant ears.
According to Wikipedia‚ although the source isn't noted, the larger elephant ears were put on in December 1946 and they stayed on until its scrapping, so the S2 had them most of its life. The small, semi-circular deflectors were ineffective and short-lived, according to the Wikepedia article.
Edit to add: That same article says the elephant ears were necessary, because it blew "heavy smoke" at lower speeds, so have the smoke start heavy and thin out at higher speeds would seem to be appropriate.
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