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Treadle (railway)
In railway signalling, a treadle is a mechanical or electrical device that detects that a train wheel has passed a particular location. They are used where a track circuit requires reinforcing with additional information about a train's location, such as around an automatic level crossing, or in an annunciator circuit, which sounds a warning that a train has passed an exact point. They also serve as a critical backup in the case of track circuit failure. The important difference between a treadle and a track circuit is that while a track circuit detects a train over a distance as long as several kilometres, a treadle provides detection at a single fixed location. Types Mechanical In situations where track circuits are unreliable due to rusty rails, for example adjacent to buffer stops and catch points, a long treadle bar is used. When this is depressed, the signaller gains indication (if they have not already done so) of a train in a section. Electro-Mechanical An electro-mec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rail Treadle
Rail or rails may refer to: Rail transport *Rail transport and related matters *Rail (rail transport) or railway lines, the running surface of a railway Arts and media Film *Rails (film), ''Rails'' (film), a 1929 Italian film by Mario Camerini *Rail (1967 film), ''Rail'' (1967 film), a film by Geoffrey Jones for British Transport Films *''Mirattu'' or ''Rail'', a Tamil-language film and its Telugu dub Magazines *Rail (magazine), ''Rail'' (magazine), a British rail transport periodical *Rails (magazine), ''Rails'' (magazine), a former New Zealand based rail transport periodical Other arts *The Rails, a British folk-rock band *Rail (theater) or batten, a pipe from which lighting, scenery, or curtains are hung Technology *Rails framework or Ruby on Rails, a web application framework *Rail system (firearms), a mounting system for firearm attachments *Front engine dragster *Runway alignment indicator lights, a configuration of an approach lighting system *Rule Augmented Interconne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hawes Junction Rail Crash
The Hawes Junction rail crashHawes Junction station is now called Garsdale occurred at 5.49 am on 24 December 1910, just north of the Lunds viaduct between Hawes Junction (now known as Garsdale station) and Aisgill on the Midland Railway's Settle and Carlisle main line in the North Riding of Yorkshire (now North Yorkshire), England. It was caused when a busy signalman, Alfred Sutton, forgot about a pair of light engines waiting at his down (northbound) starting signal to return to their shed at Carlisle. They were still waiting there when the signalman set the road for the down Scotch express. When the signal cleared, the light engines set off in front of the express into the same block section. Since the light engines were travelling at low speed from a stand at Hawes Junction, and the following express was travelling at high speed, a collision was inevitable. The express caught the light engines just after Moorcock Tunnel near Aisgill summit in Mallerstang and was almost ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Track Circuit Interrupter
A track circuit interrupter may be fitted at catch points, trap points or buffer stops to maintain a track circuit in the 'occupied' state in the event of a derailment. The track circuit remains de-energised until the interrupter is replaced. Application At catch or trap points Trap points or catch points are designed to intentionally derail vehicles making an unauthorised movement. When a vehicle derails completely, its wheels cease to shunt the track circuit. Since the vehicle might still be foul of the track, it is important to maintain the track circuit in the 'occupied' state. To achieve this, a cast iron interrupter is fitted to one of the run-off rails such that it will be struck by the wheels of a vehicle that is about to be derailed. Since the track circuit is bonded via the interrupter, it is proved to be intact when the track circuit relay is energised. At buffer stops A track circuit interrupter may be fitted behind a friction buffer stop. In the event of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clayton Tunnel Rail Crash
The Clayton Tunnel rail crash occurred on Sunday 25 August 1861, from Brighton on the south coast of England. At the time it was the worst accident on the British railway system. A train ran into the back of another inside the tunnel, killing 23 and injuring 176 passengers. Three north-bound trains left Brighton station within a few minutes of one another. At the southern entrance to Clayton Tunnel an automatic signal failed to return to danger after the first train passed, allowing the second train to follow it into the tunnel. The signaller at the south end of the tunnel belatedly waved a red flag in an attempt to stop the second train, but thought that it had not been seen. However the driver of the second train had briefly glimpsed the flag and stopped his train inside the tunnel. The signaller then misinterpreted a 'line clear' telegraph message from the signal box at the north end of the tunnel as referring to the second train instead of the first, and signalled the third ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clayton Tunnel
Clayton Tunnel is a railway tunnel located near the villages of Clayton and Pyecombe in West Sussex, between Hassocks and Preston Park railway stations on the Brighton Main Line. This tunnel is notable for its turreted and castellated north portal with a single-storey cottage on the top, as well as for being the site of a serious accident in 1861 which was influential in the adoption of a robust signalling system in the UK and elsewhere. At the Sussex Clayton Tunnel is the longest tunnel on the route. Construction of the tunnel commenced during 1839, although aspects of its design weren't approved until 1 October 1840. The accomplished tunnel builder William Hoof was the prime contractor on its construction; Clayton Tunnel was completed in 1841 after three years of work. Construction During the 1830s, the London, Brighton and South Coast Railway set about constructing the start of its railway network in the Southern region of Great Britain. One particular engineering chall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Signalman (rail)
:''This article deals with rail traffic controllers in Great Britain and Ireland; for similar functions in other jurisdictions, see Train dispatcher.'' A signalman or signaller is an employee of a railway transport network who operates the points and signals from a signal box in order to control the movement of trains. History The first signalmen, originally called Railway Policemen (leading to the nickname of 'Bobby'), were employed in the early 19th century and used flags to communicate with each other and train drivers, and hourglasses for the purpose of Time Interval Working between stations. In South Africa, a local rail signaller named Jack (baboon) achieved some fame for the unique distinction of being a chacma baboon. Additional duties It was a signalman's duty to check each train that passed their signal box, looking for the red tail lamp exhibited on the trailing vehicle, the sighting of which confirmed that the train was still complete, and thus the section was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flange Greaser 296
A flange is a protruded ridge, lip or rim, either external or internal, that serves to increase strength (as the flange of an iron beam such as an I-beam or a T-beam); for easy attachment/transfer of contact force with another object (as the flange on the end of a pipe, steam cylinder, etc., or on the lens mount of a camera); or for stabilizing and guiding the movements of a machine or its parts (as the inside flange of a rail car or tram wheel, which keep the wheels from running off the rails). Flanges are often attached using bolts in the pattern of a bolt circle. The term "flange" is also used for a kind of tool used to form flanges. Plumbing or piping A flange can also be a plate or ring to form a rim at the end of a pipe when fastened to the pipe (for example, a closet flange). A blind flange is a plate for covering or closing the end of a pipe. A flange joint is a connection of pipes, where the connecting pieces have flanges by which the parts are bolted together. A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crossing Sequence (operation)
A level crossing is an intersection where a railway line crosses a road, Trail, path, or (in rare situations) airport runway, at the same level, as opposed to the railway line crossing over or under using an Overpass#Railway, overpass or tunnel. The term also applies when a light rail line with separate Right-of-way (railroad), right-of-way or reserved track crosses a road in the same fashion. Other names include railway level crossing, railway crossing (chiefly international), grade crossing or railroad crossing (chiefly American), road through railroad, criss-cross, train crossing, and RXR (abbreviated). There are more than 100,000 level crossings in Europe and more than 200,000 in North America. History The history of level crossings depends on the location, but often early level crossings had a Flagman (rail), flagman in a nearby booth who would, on the approach of a train, wave a red flag or lantern to stop all traffic and clear the tracks. Gated crossings bec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New South Wales
) , nickname = , image_map = New South Wales in Australia.svg , map_caption = Location of New South Wales in AustraliaCoordinates: , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , established_date = Colony of New South Wales , established_title2 = Establishment , established_date2 = 26 January 1788 , established_title3 = Responsible government , established_date3 = 6 June 1856 , established_title4 = Federation , established_date4 = 1 January 1901 , named_for = Wales , demonym = , capital = Sydney , largest_city = capital , coordinates = , admin_center = 128 local government areas , admin_center_type = Administration , leader_title1 = Monarch , leader_name1 = Charles III , leader_title2 = Governor , leader_name2 = Margaret Beazley , leader_title3 = Premier , leader_name3 = Dominic Perrottet (Liberal) , national_representation = Parliament of Australia , national_representation_type1 = Senat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Railway Signalling
Railway signalling (), also called railroad signaling (), is a system used to control the movement of railway traffic. Trains move on fixed rails, making them uniquely susceptible to collision. This susceptibility is exacerbated by the enormous weight and inertia of a train, which makes it difficult to quickly stop when encountering an obstacle. In the UK, the Regulation of Railways Act 1889 introduced a series of requirements on matters such as the implementation of interlocked block signalling and other safety measures as a direct result of the Armagh rail disaster in that year. Most forms of train control involve movement authority being passed from those responsible for each section of a rail network (e.g. a signalman or stationmaster) to the train crew. The set of rules and the physical equipment used to accomplish this determine what is known as the ''method of working'' (UK), ''method of operation'' (US) or ''safeworking'' (Aus.). Not all these methods require the use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Railway Signal
A railway signal is a visual display device that conveys instructions or provides warning of instructions regarding the driver’s authority to proceed. The driver interprets the signal's indication and acts accordingly. Typically, a signal might inform the driver of the speed at which the train may safely proceed or it may instruct the driver to stop. Application and positioning of signals Originally, signals displayed simple stop or proceed indications. As traffic density increased, this proved to be too limiting and refinements were added. One such refinement was the addition of distant signals on the approach to stop signals. The distant signal gave the driver warning that they were approaching a signal which might require a stop. This allowed for an overall increase in speed, since train drivers no longer had to drive at a speed within sighting distance of the stop signal. Under timetable and train order operation, the signals did not directly convey orders to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Axle Counter
An axle counter is a system used in railway signalling to detect the clear or occupied status of a section of track between two points. The system generally consists of a wheel sensor (one for each end of the section) and an evaluation unit for counting the axles of the train both into and out of the section. They are often used to replace a track circuit. Principles and operation An axle counter consists of the axle counter sensor, which detects the individual axles of a train either via either mechanical, electrical or even fibre optic methods, as well as an evaluator, which does the logic of the system and counts the axles into and out of the section. The evaluator may also convert the analogue signal of the axle counter sensor into a digital signal. However, in some cases there is a separate unit which performs this task. The system is set up by having an axle counter sensor installed at each end of a section. As each train axle passes the axle counter sensor at the start o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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