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@Peter Horn: Definitely Exter brake as that appears to be used in English sources whereas I couldn't find an instance of the longer version. Did you want to translate the German Wiki article on it? Bermicourt (talk) 20:38, 2 July 2019 (UTC)[reply]
@Bermicourt: What is the German name of the German article? I might translate, but in the interim, a soft redirect to it may have to do. Peter HornUser talk 23:46, 2 July 2019 (UTC)[reply]
@Peter Horn: it appears to be a braked used on early tank locomotives and tenders where both weight and speed were low. On trains, they were used in conjunction with spindle brakes on the wagons themselves, a signal being given by the engine so that the brakemen knew to turn their spindles. Bermicourt (talk) 06:18, 3 July 2019 (UTC)[reply]
P.S. Also used as a parking brake. Bermicourt (talk) 06:19, 3 July 2019 (UTC)[reply]