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Narrow track centres may have to be widened on sharp curves to allow for long rail vehicles following the arc of the curve, and this increases a surveyor's workload. Widening a track centre to 5 m (16 ft) or so suits high-speed trains passing each other, and eliminates the need to widen the centres on sharp curves.
Too tight a 'crest' curve could result in the train leaving the track as it drops away beneath it; too tight a 'trough' and the train will plough downwards into the rails and damage them. More precisely, the support force R exerted by the track on a train as a function of the curve radius r, the train mass m, and the speed v, is given by
In United Kingdom, a guideline for platform safety specifies that for the platforms with train passing speeds between 160 kilometres per hour (99 mph) and 200 kilometres per hour (120 mph), there should be a yellow-line buffer zone of 1.5 metres (4.9 ft) and other warning signs.
A BNSF train of loaded well cars (or double-stack cars) at Caliente, California, United States. A Canadian National Railway double-stack container train.. 6,100 metres (20,000 ft) – United States – a June 2024 third-party study over 10 days in Arizona found that Union Pacific routinely runs intermodal trains of more than 5,500 m (18,000 ft) in length, of which the longest was a 6,100-metre ...
Track using 100 to 120 lb/yd (49.6 to 59.5 kg/m) rail is for lower speed freight branch lines or rapid transit; for example, most of the New York City Subway system track is constructed with 100 lb/yd (49.6 kg/m) rail. [citation needed] Main line track is usually built
As its name implies, metre gauge is a track gauge of 1,000 mm (3 ft 3 + 3 ⁄ 8 in). It has about 95,000 km (59,000 mi) of track. It has about 95,000 km (59,000 mi) of track. According to Italian law, track gauges in Italy were defined from the centre of each rail rather than the inside edges of the rails.
Station entrances and exits begin or end at the first level or ground level. Second level or L1 or intermediate level houses station fare control, station agents, metro card vending machines, crossovers etc. The third level or L2 or the final level houses the platforms and rail tracks. The station is 200 meters long and 25 meters wide.
Track gauge conversion is the changing of one railway track gauge (the distance between the running rails) to another. In general, requirements depend on whether the conversion is from a wider gauge to a narrower gauge or vice versa, on how the rail vehicles can be modified to accommodate a track gauge conversion, and on whether the gauge conversion is manual or automated.