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Swiss Federal Railways Am 841
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Switzerland | 1996
40 produced
Am 841 030 in August 2019 in Martigny
Am 841 030 in August 2019 in Martigny
Tiia Monto

The Am 841 is a class of 40 four-axle diesel locomotives built by GEC Alstom at Valencia for the SBB. They were based on the RENFE class 311, but built for standard gauge and are powered by a more modern variant of the MTU V8 engine with 920 kW. Power is being transmitted electrically to three-phase AC traction motors. The manufacturer designates these locomotives type GA-DE 900/AS and started production of 30 in 1996, followed by ten more.

28 of the 40 locomotives are assigned to the infrastructure division of the SBB and are being used for heavy construction trains. Twelve belong to SBB Cargo and are being used for light freight trains over short distances with non-electrified sections. In 2024 Müller Frauenfeld presented the first rebuilt Aeam 841 “Tribrid” locomotive with an additional pantograph and batteries.

General
Built1996-1997
ManufacturerGEC Alstom
Wheel arr.B-B 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length46 ft 5 1/2 in
Wheelbase31 ft 11 7/8 in
Rigid wheelbase7 ft 6 9/16 in
Service weight158,733 lbs
Adhesive weight158,733 lbs
Axle load39,683 lbs
Boiler
Power Plant
Power
Power sourcediesel-electric
Top speed50 mph
EngineMTU 8V 396 TB14
Engine typeV8 diesel
Fuel528 us gal (diesel)
Engine output1,234 hp (920 kW)
Calculated Values
diesel locomotive
switcher
three-phase AC
last changed: 10/2025
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