MFO De 4/4

Built by SLM, MFO

Top speed

75 km/h

47 mph

Weight

41 t

90,389 lb

Length

14.6 m

47 ft 11 in

Track gauge

1,000 mm

Metre gauge

Years built

1941–1942

Axle arrangement

Bo'Bo'

Overview of the MFO De 4/4

Discover the ZB De 4/4, a versatile electric locomotive operated by Switzerland's Zentralbahn.

Constructed by SLM and MFO between 1941 and 1942, this locomotive underwent significant refurbishment from 1992 to 1994, ensuring its continued service.

Designed for narrow-gauge railways with a track gauge of 1000 mm, the ZB De 4/4 boasts a top speed of 75 km/h.

Its Bo'Bo' wheel arrangement and a weight of 41 tons highlight its sturdy construction, while its electrical system operates on 15 kV AC 16.7 Hz.

This robust electric locomotive exemplifies reliable Swiss engineering within the rail transport sector.

MFO De 4/4 technical specifications

	Value	Imperial / US
Series	De 4/6
Built by	SLM, MFO · 1941–1942
Refurbished	1992 - 1994
Top speed	75 km/h47 mph	47 mph
Electric systems	15 kV AC 16.7 Hz
Track gauge	1,000 mmMetre gauge3 ft 3⅜ in	3 ft 3⅜ in
UIC axle arrangement	Bo'Bo'
Length	14.6 m47 ft 11 in	47 ft 11 in
Weight	41 t90,389 lb	90,389 lb