High Quality Content by WIKIPEDIA articles! The Rhaetian Railway Gem 4/4 is a two member class of metre gauge Bo'Bo' electro-diesel locomotives operated since 1968 by the Rhaetian Railway (RhB), which is the main railway network in the Canton of Graubunden, Switzerland. The class is so named under the Swiss locomotive and railcar classification system. According to that system, Gem 4/4 denotes a narrow gauge electro-diesel engined adhesion locomotive with a total of four axles, all of which are drive axles. The companies involved in building the Gem 4/4s were the Swiss Locomotive and Machine Works (SLM), Schweizerische Waggonfabrik Schlieren (SWS), Brown, Boveri

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