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Swiss Federal Railways Fb 4/4
later Be 4/4
Switzerland | 1907
4 produced
Fb 4/4 in the SBB type sheet
Fb 4/4 in the SBB type sheet
SBB Historic

After the first type Fb 3/5 three-phase locomotives, two more were delivered that did not have carrying axles. The aim was to use the entire weight of the locomotive as adhesive weight, and the locomotives were still capable of a top speed of 75 km/h. This was possible because the outer axles were designed as Klien-Lindner hollow axles. The power was provided by two traction motors arranged low in the frame via jackshafts and coupling rods

Thanks to new traction motors, an hourly output of 850 hp could now be accessed per motor. In addition, the pole-changing now allowed four continuous driving speeds of 28, 37, 56 and 74 km/h. Since the traction motors were independent of each other, if one motor failed, the second could still to be used. Since the technology proved so successful, two more locomotives were built in 1919. They were used until 1930, when three-phase operation was ended.

Variant366-367368-369
General
Built1907-19081919
Manufacturermechanical part: SLM, electrical part: BBC
Axle configD 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length38 ft 2 1/4 in
Service weight152,119 lbs154,323 lbs
Adhesive weight152,119 lbs154,323 lbs
Axle load38,140 lbs38,581 lbs
Boiler
Variant366-367368-369
Power Plant
Power
Power sourceelectric - three-phase
Electric system3,000 V 16 Hz
Hourly power1,676 hp (1,250 kW)
Top speed47 mph
Starting effort26,977 lbf
Calculated Values
electric locomotive
freight
passenger
three-phase AC
last changed: 03/2023
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