SBB-CFF-FFS Am 6/6

The Am 6/6, later known as Am 861, is a class of diesel shunting locomotive which were built for the Swiss Federal Railways (SBB) and were intended for use as heavy hump shunters at the Limmattal classification yard.[1][2]

SBB-CFF-FFS Am 6/6
Type and origin Power type Diesel Builder Thyssen Henschel, Brown, Boveri & Cie Build date 1976 Total produced 6
Specifications Configuration: ​  • AAR C-C  • UIC Co′Co′ Gauge 1,435 mm (4 ft 8+1⁄2 in) Bogies Flexifloat Driver dia. 1,040 mm (3 ft 5 in) Wheelbase 12.2 metres (40 ft) Length 17.4 metres (57 ft) Height 4.5 metres (15 ft) Axle load 18.5 t (41,000 lb) Loco weight 111 t (245,000 lb) Traction motors (6) Transmission Diesel-electric
Performance figures Maximum speed 85 km/h (53 mph) Power output 1,440 kW (1,930 hp)
Career Operators SBB-CFF-FFS Class Am 6/6, later Am 861 Numbers 18521–18526 Locale Limmattal classification yard Disposition All withdrawn

A total of six locomotives were built jointly by Thyssen Henschel and Brown, Boveri & Cie for SBB by and these received running numbers 18521 to 18526. In the late 1990s they received modernized electrical systems

The locomotives utilized a Co′Co′ wheel arrangement and a diesel-electric transmission, had six three-phase asynchronous traction motors and Flexifloat bogies (bogies without pivots and cradles) while being powered by 1.440 kW (1,930 hp) diesel engines.[3]

In January 2004 locomotive 18524 was withdrawn to serve as a parts donor for the remainder of the class. The other five locomotives continued in service with SBB until March 2020, by which point the remainder were withdrawn from service. As of April 2020 these locomotives are awaiting to be scrapped.