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WAB He 2/2 51–58

WAB He 2/2 51–58
Factory photograph of Alioth of the He 2/2 56, 1910
Type and origin Power type Electric Builder Swiss Locomotive and Machine Works (SLM), Elektrizitätsgesellschaft Alioth (EAG) Build date 1909–1910 Total produced 8
Specifications Configuration: ​  • UIC 2zz Gauge 1,435 mm (4 ft 8+1⁄2 in) Loco weight 16 tonnes (16 long tons; 18 short tons) Electric system/s 1,500 V DC Catenary Current pickup(s) Pantograph
Performance figures Maximum speed 12 km/h (7 mph) Power output 227 kW (300 hp)
Career Operators WAB Numbers 51 to 58

The He 2/2 51 to 58 of the Wengernalp Railway, abbreviated WAB, are electric rack railway locomotive for 1500 volt direct current and a track gauge of 800 mm. They were built in 1909 and 1910 on the occasion of the electrification of the railway lines Lauterbrunnen–Wengernalp–Kleine Scheidegg as well as Grindelwald–Grindelwald Grund–Kleine Scheidegg and served as a model for the largely identical locomotives that were subsequently procured He 2/2 59 to 63.

The machines with two running axles and two drive rack gears are pure rack railway locomotives. The two drive gears, for the Riggenbach-Pauli and Von Roll rack system, are not mounted on the running axles, but directly next to the running axles towards the center of the vehicle. The mechanical part comes from the Swiss Locomotive and Machine Works, abbreviated SLM, in Winterthur, the locomotives received the electrical equipment through the Elektrizitätsgesellschaft Alioth, abbreviated EGA, colloquial Alioth, in Münchenstein. For the descent, the locomotives have a self-excited electric rheostatic braking as an inertia brake, with which it is possible to make the descent with the pantograph lowered.