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Railway coupling
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== Balance lever coupling == {{Main|Balance lever coupling}} [[File:20060804S29 22Kupp.jpg|thumb|Balance lever coupling on narrow gauge coach in Switzerland]] The balance lever coupling, also central buffer coupling with two screw coupling, is a coupler commonly used on narrow gauge railroads with tight curves. By swapping the pulling and pushing devices, the standard screw coupling used on standard gauge railroads became a center buffer coupling with one screw coupling on each side of the buffer. The screw couplers are connected to a compensating lever that pivots on a vertical trunnion on the center buffer rod, allowing an even distribution of tractive forces between the two screw couplers.<ref>Bruno Lämmli: [https://www.lokifahrer.ch/Lukmanier/Rollmaterial/Kupplung/Zug-Druck.htm ''Zug- / Stossvorrichtung.''] Auf: ''Lokifahrer,'' 2021.</ref>
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