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The length of a train, including the longest trains, may be measured in number of wagons (for bulk loads such as coal and iron ore) or in metres for general freight. Train lengths and loads on electrified railways, especially lower voltage 3000 V DC and 1500 V DC, are limited by traction power considerations. Drawgear and couplings can be a limiting factor, tied in with curves, gradients and crossing loop lengths. Conventional freight trains can average nearly 2,000 metres.〔Popular Mechanics: http://www.popularmechanics.com/technology/engineering/extreme-machines/4345689〕 Freight trains with a total length of three or four times that average are possible with the advent of distributed power units, or additional locomotive engines between or behind long chains of freight cars (referred to as a "consist"). These distributed power units enable much longer, heavier loads without the increased risks of derailing that stem from the stress of pulling very long chains of train-cars around curves. == Bulk == * Rail gauge: except where shown. * Australia * * Rio Tinto—29,500 tonnes of iron ore—2.4 km, three locomotives * * BHP Billiton iron ore typically 336 cars, 44,500 tonnes of iron ore, over 3 km long, six to eight locomotives including intermediate remote unit * * * The record-breaking ore train from the same company, 683 cars and 7,350 m long, once carried 82,000 metric tons of ore for a total weight of the train, largest in the world, of 99735 tonnes. It was driven by eight locomotives distributed along its length to keep the couplings loads and curve performance controllable. * * Leigh Creek coal—2.8 km, 161 wagons and 2 locomotives.〔http://www.pomgonewalkabout.com/Page3.htm〕 * * Cane tramway - 75 wagons ( gauge) 〔Light Railways October 2013, pg 22〕 * Brazil * * Carajás Railway gauge iron ore typically 330-car trains, each 3 km long.〔http://www.vale.com.br/en-us/o-que-fazemos/logistica/ferrovias/estrada-de-ferro-carajas/pages/default.aspx〕 * China * *Daqin Railway coal trains—20,000 t, 3.2 km, 210 wagons * Mauritania—3 km〔(Railways Africa—MAURITANIA’S LONG TRAIN )〕—iron ore from Zouérat—trains lurch violently when accelerating or braking * Indonesia (proposed) * * Muara Wahau coal to Bengalon port — 2196 m〔Railway Gazette International November 2010, p56〕 * Russia * * The longest train there was recorded in 1986, carrying Kuzbass coal in 439 cars, for the train length of 6500 meters and total weight of 43,500 tonnes. * South Africa * * Sishen–Saldanha railway line ore trains on — 4100 m〔http://www.ihha2011.org/doc-pdf/heavy_haul_operations_south_africa.pdf〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「longest trains」の詳細全文を読む スポンサード リンク
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