The Bm 4/4 is a class of heavy diesel shunting locomotives built for Swiss Federal Railways. 46 examples were built between 1960 and 1970, numbered 18401 to 18446, and a limited number remain in service. Starting in 2006, the class was slowly being replaced by new Vossloh-built locomotives.

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SBB-CFF-FFS Bm 4/4
Bm 4/4 18439 at Lausanne train station
Type and origin Power type Diesel Builder SLM, SAAS Build date 1960–1970 Total produced 46
Specifications Configuration: ​  • AAR B-B  • UIC Bo′Bo′ Gauge 1,435 mm (4 ft 8+1⁄2 in) Length 12,650–13,710 mm (41 ft 6 in – 45 ft 0 in) Loco weight 72 tonnes (70.9 long tons; 79.4 short tons) Traction motors Four Transmission Diesel electric
Performance figures Maximum speed 75 km/h (47 mph) Power output 620 kW (831 hp)
Career Operators SBB-CFF-FFS Numbers 18401–18446 Withdrawn From 2006

See also

• List of stock used by Swiss Federal Railways

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