Winterthur universal drive

The Winterthur universal drive or SLM universal drive (German: Universal-Antrieb Winterthur) was a drive for electric locomotives invented by Swiss engineer Jakob Buchli at Swiss Locomotive and Machine Works (SLM) in the 1920s. == Design == After developing the successful Buchli drive at Brown, Boveri & Cie (BBC), Buchli moved to SLM at Winterthur in 1924, where he designed the universal drive.