SBB-CFF-FFS Bm 4/4

Specifications
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

Type and origin
Type and origin
Power type	Diesel
Builder	SLM, SAAS
Build date	1960–1970
Total produced	46

SBB-CFF-FFS Bm 4/4
SBB-CFF-FFS Bm 4/4
	Bm 4/4 18439 at Lausanne train station
Power type
Type and origin
Power type	Diesel
Builder	SLM, SAAS
Build date	1960–1970
Total produced	46
Configuration:;
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
Maximum speed
Performance figures
Maximum speed	75 km/h (47 mph)
Power output	620kw (840hp)
Operators
Career
Operators	SBB-CFF-FFS
Numbers	18401–18446
Withdrawn	From 2006

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, Starting in 2006, the class was slowly being replaced by new Vossloh-built locomotives. The last SBB example was withdrawn in 2024 but a few are in use with private operators

See also