In 1989 the Swiss Federal Railway SBB ordered three prototypes of 0-6-0 shunting Diesel locomotives type Em 831. These locomotives had initially been designed for a speed of 80 km/h, but insufficient vehicle running stability enforced a reduced speed limit of 60 km/h. At that time seemingly no one found a solution to improve the running stability and consequently, no further locomotives of this type have been built. When the locomotives were phased out by SBB, the Swiss firm Stauffer bought the lot and asked DLM, if it were possible to modify the locomotives for higher speed. This was successfully done with a few moderate modifications. The tests showed a stable running stability up to at least 93 km/h and the Em 831 are now officially approved for 80 km/h. 

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DS Montreux über die Toppen beflaggt. Foto Robert Horlacher

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