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The movement of the contact wire across the head of the pantograph is called the "sweep". The zigzagging of the overhead line is not required for trolley poles. For tramways, a contact wire without a messenger wire is used. Depot areas tend to have only a single wire and are known as "simple equipment" or "trolley wire".
A trolley pole is not attached to the overhead wire. The pole sits atop a sprung base on the roof of the vehicle, with springs providing the pressure to keep the trolley wheel or shoe in contact with the wire. If the pole is made of wood, a cable brings the electric current down to the vehicle. A metal pole may use such a cable, or may itself ...
Contact between a pantograph and an overhead line is usually assured through a block of graphite. This material conducts electricity while working as a lubricant. As graphite is brittle, pieces can break off during operation. Poorly-built pantographs can seize the overhead wire and tear it down, and poor-condition wires can damage the pantograph.
As the tram drew forward, the conduit channel moved under the tram, carrying the plough into position. [15] The conductor pulled down the trolley pole and stowed it. The ploughman's job was a fairly skilled one because, if he failed to locate the plough fork correctly, it or the plough could jam in the plough channel and cause lengthy delays.
Trolley pole wheel on top of the trolley pole of Twin City Rapid Transit Company No. 1300. A current collector (often called a "pickup") is a device used in trolleybuses, trams, electric locomotives and EMUs to carry electric power from overhead lines, electric third rails, or ground-level power supplies to the electrical equipment of the vehicles.
The first bow collector was designed by the German engineer Walter Reichel in 1889 and shown at the World Expo in Paris the same year. [1] Reichel worked closely with Ernst Werner von Siemens, and with Siemens being a dominating force in the development of tramways in Europe, the bow collector quickly became the standard solution on the continent for collecting current.
An aerial tramway consists of one or two fixed cables (called track cables), one loop of cable (called a haulage rope), and one or two passenger or cargo cabins.The fixed cables provide support for the cabins while the haulage rope, by means of a grip, is solidly connected to the truck (the wheel set that rolls on the track cables).
Tram (streetcar) system used this arrangement throughout, probably due to legal constraints on ground return currents. [citation needed] Havana and Guanabacoa, [citation needed] Cuba. Tram (streetcar) systems in both cities used this arrangement. Lisbon, Portugal. Elevador da Bica, Elevador da Glória and Elevador da Lavra. [citation needed]