BTB E2E

The BTB E2E, also known as F 2/2 and De 2/2, were a pair of Swiss electric locomotives operated by Burgdorf Thun Bahn (BTB) in the early twentieth century. They are the oldest three phase locomotives designed for full service operation that have been preserved. The locomotives were built by Brown, Boveri & Cie (BBC) and Schweizerische Lokomotiv- und Maschinenfabrik (SLM) and entered service in 1899. They were powered by two 110 kW (150 hp) 750V AC electric motors which drove two axles. A two speed gearbox enabled the locomotives to travel at 18 km/h (11 mph) and 36 km/h (22 mph), the latter for passenger transport. The gearbox was later upgraded, raising the speed to 50 km/h (31 mph). The locomotives provided valuable service until 1930.

BTB E2E

The BTB E2E, also known as F 2/2 and De 2/2, were a pair of Swiss electric locomotives operated by Burgdorf Thun Bahn (BTB) in the early twentieth century. They are the oldest three phase locomotives designed for full service operation that have been preserved. The locomotives were built by Brown, Boveri & Cie (BBC) and Schweizerische Lokomotiv- und Maschinenfabrik (SLM) and entered service in 1899. They were powered by two 110 kW (150 hp) 750V AC electric motors which drove two axles. A two speed gearbox enabled the locomotives to travel at 18 km/h (11 mph) and 36 km/h (22 mph), the latter for passenger transport. The gearbox was later upgraded, raising the speed to 50 km/h (31 mph). The locomotives provided valuable service until 1930.