SBB-CFF-FFS Bm 4/4
| SBB-CFF-FFS Bm 4/4 |
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| Type and origin |
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| Power type |
Diesel |
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| Builder |
SLM, SAAS |
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| Build date |
1960–1970 |
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| Total produced |
46 |
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| Specifications |
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| UIC classification |
Bo′Bo′ |
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| Gauge |
1,435 mm (4 ft 8 1⁄2 in) |
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| Length |
12,650–13,710 mm (41 ft 6 in–45 ft 0 in) |
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| Locomotive weight |
72 tonnes (70.9 long tons; 79.4 short tons) |
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| Traction motors |
Four |
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| Transmission |
Diesel electric |
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| Performance figures |
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| Maximum speed |
75 km/h (47 mph) |
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| Power output |
620 kW (831 hp) |
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| Career |
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| Operator(s) |
SBB-CFF-FFS |
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| Number(s) |
18401–18446 |
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| Withdrawn |
From 2006 |
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The Bm 4/4 is a heavy diesel shunter built for Swiss Federal Railways. 46 examples were built between 1960 and 1970, and a number remain in service. The class is currently being replaced by new Vossloh locomotives.
See also
 Standard gauge locomotives of Switzerland |
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| | SBB-CFF-FFS | Steam | |
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| Electric | | | Experimental and prototypes | |
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| Diesel | | | Experimental and prototypes | |
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| Electro-diesel | |
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