"Swiss Locomotive and Machine Works (German Schweizerische Lokomotiv- und Maschinenfabrik; French Société Suisse pour la Construction de Locomotives et de Machines; or for both, SLM) was ...
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a railway equipment manufacturer based in Winterthur in Switzerland. Much of the world´s mountain railway equipment was constructed by the company." - (en.wikipedia.org 30.01.2020)