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Overspeed Sensor System
The Train Protection & Warning System (TPWS) is a train protection system used throughout the British passenger main-line railway network, and in Victoria, Australia. According to the UK Rail Safety and Standards Board, the purpose of TPWS is to stop a train by automatically initiating a brake demand, where TPWS track equipment is fitted, if the train has: passed a signal at danger without authority; approached a signal at danger too fast; approached a reduction in permissible speed too fast; approached buffer stops too fast. TPWS is not designed to prevent signals passed at danger (SPADs) but to mitigate the consequences of a SPAD, by preventing a train that has had a SPAD from reaching a conflict point after the signal. A standard installation consists of an on-track transmitter adjacent to a signal, activated when the signal is at danger. A train that passes the signal will have its emergency brake activated. If the train is travelling at speed, this may be too late to stop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Train Protection System
A train protection system is a railway technical installation to ensure safe operation in the event of human error. Development Train stops The earliest systems were train stops, as still used by the New York City Subway, the Toronto rapid transit, Toronto subway, the London Underground, the Moscow Subway (only on the older lines) and the Berlin S-Bahn. Beside every Railway signal, signal is a moveable arm. If the signal is red, levers connected to valves on any passing train hit the arm, opening the Air brake (rail), brake line, applying the emergency brake, If the signal shows green, the arm is turned away from the levers and there is no contact. The Great Western Railway in the UK introduced its 'automatic train control#United Kingdom, automatic train control' system in the early years of the 20th century. Each distant signal had before it a ramp between the running rails. If the signal showed green, the ramp was energised with a low voltage current which was passed to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Automatic Warning System
Automatic Warning System (AWS) is a railway safety system invented and predominantly used in the United Kingdom. It provides a train driver with an audible indication of whether the next Railway_signal, signal they are approaching is clear or at caution. Depending on the upcoming signal state, the AWS will either produce a 'horn' sound (as a warning indication), or a 'bell' sound (as a clear indication). If the train driver fails to acknowledge a warning indication, an emergency brake application is initiated by the AWS; if the driver correctly acknowledges the warning indication, by pressing an acknowledgement button, then a visual 'sunflower' is displayed to the driver, as a reminder of the warning. Principles of operation AWS is a system based on trains detecting magnetic fields. These magnetic fields are created by permanent magnets and electromagnets installed on the track. The polarity and sequence of magnetic fields detected by a train determine the type of indication ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Australia
Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller islands. It has a total area of , making it the list of countries and dependencies by area, sixth-largest country in the world and the largest in Oceania. Australia is the world's flattest and driest inhabited continent. It is a megadiverse countries, megadiverse country, and its size gives it a wide variety of landscapes and Climate of Australia, climates including deserts of Australia, deserts in the Outback, interior and forests of Australia, tropical rainforests along the Eastern states of Australia, coast. The ancestors of Aboriginal Australians began arriving from south-east Asia 50,000 to 65,000 years ago, during the Last Glacial Period, last glacial period. By the time of British settlement, Aboriginal Australians spoke 250 distinct l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotland, Wales and Northern Ireland. The UK includes the island of Great Britain, the north-eastern part of the island of Ireland, and most of List of islands of the United Kingdom, the smaller islands within the British Isles, covering . Northern Ireland shares Republic of Ireland–United Kingdom border, a land border with the Republic of Ireland; otherwise, the UK is surrounded by the Atlantic Ocean, the North Sea, the English Channel, the Celtic Sea and the Irish Sea. It maintains sovereignty over the British Overseas Territories, which are located across various oceans and seas globally. The UK had an estimated population of over 68.2 million people in 2023. The capital and largest city of both England and the UK is London. The cities o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southall Rail Crash
The Southall rail crash occurred on 19 September 1997, on the Great Western Main Line at Southall, West London. An InterCity 125 high speed passenger train (HST) failed to slow down in response to warning signals and collided with a freight train crossing its path, causing seven deaths and 139 injuries. The passenger train operating company had failed to inform Railtrack and the signaller that the automatic warning system (AWS), which warns drivers of adverse signals, had been turned off in the cab of the HST. As a result, the signaller set a route which would stop the HST and allow the freight train to cross in front of it. If the signaller had known that the AWS in the express was not working, he would have been prevented by the operating rules from setting a conflicting route. The HST driver did not apply the brakes until it was too late because he was packing his bag and did not see the cautionary signals. He was charged with manslaughter by gross negligence, but the charges ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ladbroke Grove Rail Crash
The Ladbroke Grove rail crash (also known as the Paddington rail crash) was a rail accident which occurred on 5 October 1999 at Ladbroke Grove in London, England, when a Thames Trains-operated passenger train Signal passed at danger, passed a signal at danger, colliding almost head-on with a First Great Western-operated passenger train. With 31 people killed and 417 injured, it was one of the worst rail accidents in 20th-century British history. It was the second major crash on the Great Western Main Line in just over two years, the first being the Southall rail crash of September 1997, a few miles west of this crash. Both crashes would have been prevented by an operational Automatic_Train_Protection_(United_Kingdom), automatic train protection (ATP) system, wider fitting of which had been rejected on cost grounds. The crash severely damaged public confidence in the management and regulation of safety of rail transport in Great Britain, Britain's privatised railway system. A p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Purley Station Rail Crash
The Purley station rail crash was a train collision that occurred just to the north of Purley railway station in the London Borough of Croydon on Saturday 4 March 1989, leaving five dead and 88 injured. The collision was caused by the driver of one of the trains passing a signal at danger; he pleaded guilty to manslaughter and was sentenced to 12 months in prison plus six months suspended, although this was reduced to four months upon appeal, and in 2007 overturned. The Department of Transport report noted that the signal had a high incidence of being passed at danger and recommended that an automatic train protection system should be introduced without delay and in the interim a repeater for the signal that had been passed be installed. Collision On 4 March 1989 the 12:50 Horsham to London Victoria, consisting of a four-car class 423 electric multiple unit no. 3441, stopped at Purley railway station. As it left the station, it crossed from the slow line to the fast line as sch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Low Railhead Adhesion
Slippery rail, or low railhead adhesion, is a condition of railways (railroads) where contamination of the railhead reduces the traction between the wheel and the rail. This can lead to wheelslip when the train is taking power, and wheelslide when the train is braking. One common cause of contamination is fallen leaves that adhere to the railhead (top surface) of railway tracks. The condition results in significant reduction in friction between train wheels and rails, and in extreme cases can render the track temporarily unusable. In Britain, the situation is colloquially referred to as "leaves on the line". Low adhesion caused by weather Railhead contamination caused by weather conditions can occur at any time of year. The leaf fall season causes the most disruption to rail operations. In heavily deciduous forested areas like the American Mid-Atlantic states, New England, many parts of Europe including the UK, and Southern Ontario, Canada, the problem can arise. Where the l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2021 Salisbury Rail Crash
The Salisbury Rail Crash was a railway accident on 31 October 2021, at Salisbury, Wiltshire, United Kingdom. Two trains, travelling on converging lines, collided at Salisbury Tunnel Junction, approximately northeast of Salisbury railway station. Fourteen people, including one of the train drivers, were taken to hospital. Incident On 31 October 2021, Great Western Railway (train operating company), Great Western Railway's (GWR) 17:08 to four-carriage service (Train reporting number, reporting number 1F30) operated by a pair of two-carriage British Rail Class 158, Class 158s - 158762 and 158763, was passing through Salisbury Tunnel Junction where the Wessex Main Line converges with the West of England Main Line. At the same time, the South Western Railway (2017-2025), South Western Railway's (SWR) 17:20 to service (reporting number 1L53) operated by a single three-carriage British Rail Class 159, Class 159 - 159102, was approaching the junction. The SWR train Signal pass ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
