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7. Special case: the trolleybus
Although a road vehicle, the "trolleybus" used for urban transport in many of the world's major cities uses an electrical power supply similar to that used in our study. Insulated from the road surface by its pneumatic wheels, the power supply is provided by two overhead contact wires, which are contacted by two contact wipers carried by articulated roof-mounted poles known as trolleys (figure 30 ).
The two contact wires have the same cross-section as that of a railway catenary, and the two trolleys are fitted with articulated U-shaped rubbers to enable them to rotate (figure 31 a ).
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Special case: the trolleybus
Environment and maintenance of electrical power distribution
Bibliography
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Alstom Transport http://www.alstom.fr
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Standards and norms
- Spécification technique concernant la fourniture de fils rainurés pour lignes de contact - UIC 870 - 01-56
- Railway applications – Traction network supply voltages - NF EN 50163/A1 - 10-07
- Railway applications – Rolling stock – Pantographs: characteristics and tests – Part 2: Pantographs for metros and streetcars - NF EN 50206-2 - 03-11
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