http://www.unitedstreetcar.com/index.php?option=com_frontpage&Itemid=1 http://www.railwaypreservation.com/vintagetrolley/vintagetrolley.htm

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"The terms "tram" and "tramway" were originally Scots and Northern English words for the type of truck used in coal mines and the tracks on which they ran — probably derived from a North Sea Germanic word of unknown origin meaning the "beam or shaft of a barrow or sledge", also "a barrow" or container body. Although "tram" and "tramway" have been adopted by many languages, they are not used universally in English, North Americans preferring "trolley", "trolley car" or "streetcar". The term "streetcar" is first recorded in 1860, and is a North American usage, as is "trolley," which is believed to derive from the "troller," a four wheeled device that was dragged along dual overhead wires by a cable that connected the troller to the top of the car and collected electrical power from the overhead wire, sometimes simply strung, sometimes on a catenary. The trolley pole, which supplanted the troller early-on, is fitted to the top of the car and is spring-loaded in order to keep the trolley wheel, at the upper of the pole, firmly in contact with the overhead wire. The terms trolley pole and trolley wheel both derive from the troller.[2]"