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Wheel Slide Protection
Wheel slide protection and wheel slip protection are railway terms used to describe automatic systems used to detect and prevent wheel-slide during braking or wheel-slip during acceleration. This is analogous to ABS and traction control systems used on motor vehicles. It is particularly important in slippery rail conditions. Sanding Sanding is one method of reducing wheel slip or slide. Locomotives and multiple units have sandboxes which can place dry sand on the rails, in front of the wheels. This may be initiated automatically when the Wheel Slide Protection system senses loss of adhesion, or the driver can operate it manually. Sanding may be connected to a computer system that determines the train's direction of travel and where the sand should be applied: either in front of or behind the trucks. In older locomotives there was a manual lever attached to a valve that had three positions: Off, Forward, and Aft. Automatic control systems Wheel Slide Protection (WSP) equipment ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anti-lock Braking System
An anti-lock braking system (ABS) is a Automotive safety, safety anti-Skid (automobile), skid Brake, braking system used on aircraft and on land motor vehicle, vehicles, such as cars, motorcycles, trucks, and buses. ABS operates by preventing the wheels from locking up during braking, thereby maintaining Traction (mechanics), tractive contact with the road surface and allowing the driver to maintain more control over the vehicle. ABS is an automated system that uses the principles of threshold braking and cadence braking, techniques which were once practiced by skillful drivers before ABS was widespread. ABS operates at a much faster rate and more effectively than most drivers could manage. Although ABS generally offers improved vehicle control and decreases stopping distances on dry and some slippery surfaces, on loose gravel or snow-covered surfaces ABS may significantly increase braking distance, while still improving steering control. Since ABS was introduced in production v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Signal Passed At Danger
A signal passed at danger (SPAD) is an event on a railway where a train passes a stop signal without authority. This is also known as running a red, in the United States as a stop signal overrun (SSO) and in Canada as passing a stop signal. SPAD is defined by Directive 2014/88/EU as any occasion when any part of a train proceeds beyond its authorised movement. Unauthorised movement means to pass: * ''a trackside colour light signal or semaphore at danger, or an order to STOP where a Train Protection system (TPS) is not operational,'' * ''the end of a safety related movement authority provided in a TPS,'' * ''a point communicated by verbal or written authorisation laid down in regulations,'' * ''stop boards (buffer stops are not included) or hand signals.'' Etymology The name derives from red colour light signals and horizontal semaphore signals in the United Kingdom, which are said to be ''at danger'' when they indicate that trains must stop (also known as the signal bei ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Decelostat
Decelostat is a wheel slide protection system developed by Westinghouse Air Brake Company that is used in railroad cars to prevent over-braking that causes wheel-slide, a condition of reduction in friction between train wheels and rails. This low wheel/rail adhesion condition reduces braking performance and causes damage to wheels (wheel spalling and wheel flat) and the rails. When over-braking, the Decelostat will detect rapid deceleration of wheel rotation caused by creep in the wheelset, another condition preceding the wheel-slide. Once detected, the system manipulates brake valves to reduce brake pressure. This allows the affected wheels to rotate at the speeds that are more comparable to the speeds of the train to gain the wheel/rail adhesion again. When that happens, the system deactivates to allow the brake pressure to be restored to continue braking. The system may reactivate again if it detects another creep. The cycle of activation and deactivation is usually brie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Union Internationale Des Chemins De Fer
The International Union of Railways (, UIC) is an international rail transport industry body based in Paris. History The railways of Europe had originated during the nineteenth century as many separate concerns across numerous nations; this led to disparate and conflicting standards emerging and thus onto incompatibility. One prominent example was the British Gauge War, during which different rail transport, railway companies were laying different track gauges across Great Britain, causing inefficiency wherever a break of gauge occurred, prior to an Regulating the Gauge of Railways Act 1846, Act of Parliament the issue in 1846 by establishing one standard gauge of . The early effort towards standardisation somewhat influenced railways aboard as well, however various other track gauges persisted and developed across the world; even through to the twenty first century, incompatible track gauges, let alone other issues, persisted to hinder interoperability efforts. Several key eve ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Standards Institution
The British Standards Institution (BSI) is the Standards organization, national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies standards certification services for business and personnel. History BSI was founded as the Engineering Standards Committee in London in 1901.Robert C McWilliam. BSI: The first hundred years. 2001. Thanet Press. London It subsequently extended its standardization work and became the British Engineering Standards Association in 1918, adopting the name British Standards Institution in 1931 after receiving a Royal charter, Royal Charter in 1929. In 1998 a revision of the Charter enabled the organization to diversify and acquire other businesses, and the trading name was changed to BSI Group. The Group now operates in 195 countries. The core business remains standards and standards related services, although the majority of the Group's revenue comes from management systems ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wabtec
Westinghouse Air Brake Technologies Corporation, commonly known as Wabtec, is an American company formed by the merger of the Westinghouse Air Brake Company (WABCO) and MotivePower in 1999. It is headquartered in Pittsburgh, Pennsylvania. Wabtec manufactures products for locomotives, Railway freight car, freight cars and Passenger car (rail), passenger transit vehicles, and builds new locomotives up to . It is a Fortune 500 company. The company purchased GE Transportation on February 25, 2019. History The company's origins go back to 1869 with the founding of the Westinghouse Air Brake Company. That company (known as WA&B and later also as WABCO) became independent in 1990 via a management buy-out, and went public in 1995. (Another company, WABCO Vehicle Control Systems, also created from the Westinghouse Brake Company, is independent of Wabtec. It was spun off by American Standard Companies in 2007, and is today part of German automotive components firm ZF Friedrichshafen.) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knorr-Bremse
Knorr-Bremse AG is a German manufacturer of braking systems for rail and commercial vehicles that has operated since 1905. Other products in the company's portfolio include intelligent door systems, control components, air conditioning systems for rail vehicles, torsional vibration dampers, and transmission control systems for commercial vehicles. The Group has a presence in over 30 countries, at 100 locations. In 2022, the Group's workforce of over 31,000 achieved worldwide sales of EUR 7.15 billion. History Foundation and early years The Germany engineer Georg Knorr established ''Knorr-Bremse GmbH'' in 1905 in Boxhagen-Rummelsburg, Neue Bahnhofstraße, outside Berlin (since 1920 part of Berlin-Friedrichshain). From the onset, the company benefitted heavily from Knorr's prior experience working on railway braking systems at, ''Carpenter & Schulze'', a separate company that he owned. Knorr promptly put into production an innovative rapid release brake that could b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Faiveley Transport
Faiveley Transport (), formerly Faiveley, is an international manufacturer and supplier of equipment for the railway industry founded in 1919. It introduced the single-arm pantograph in 1955. The company has subsidiaries in more than 24 countries. The majority of Faiveley Transport's outstanding stock is owned by Wabtec, which acquired majority stock ownership from the Faiveley family in 2016. History First years In 1919, Louis Faiveley founded in Saint-Ouen, France, the ''Établissements Louis Faiveley'', a small assembly shop centered on electromechanical parts. It soon grew and became one of the French railway system's leading suppliers. It introduced its first pantograph in 1923. In 1930, it also ventured into the manufacture of door systems for trains. By the 1930s, it was already one of France's leading companies in all its fields of activity. In 1935, the company became a Société Anonyme, although the shares' majority stayed in hands of the Faiveley family. After t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knorr Bremse
Knorr-Bremse AG is a German manufacturer of Brake, braking systems for Train, rail and commercial vehicles that has operated since 1905. Other products in the company's portfolio include intelligent door systems, control components, air conditioning systems for rail vehicles, torsional vibration dampers, and transmission control systems for commercial vehicles. The Group has a presence in over 30 countries, at 100 locations. In 2022, the Group's workforce of over 31,000 achieved worldwide sales of EUR 7.15 billion. History Foundation and early years The Germany engineer Georg Knorr established ''Knorr-Bremse GmbH'' in 1905 in Rummelsburg, Boxhagen-Rummelsburg, Neue Bahnhofstraße, outside Berlin (since 1920 part of Berlin-Friedrichshain). From the onset, the company benefitted heavily from Knorr's prior experience working on railway braking systems at, ''Carpenter & Schulze'', a separate company that he owned. Knorr promptly put into production an innovative rapid rele ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coefficient Of Friction
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. Types of friction include dry, fluid, lubricated, skin, and internal -- an incomplete list. The study of the processes involved is called tribology, and has a history of more than 2000 years. Friction can have dramatic consequences, as illustrated by the use of friction created by rubbing pieces of wood together to start a fire. Another important consequence of many types of friction can be wear, which may lead to performance degradation or damage to components. It is known that frictional energy losses account for about 20% of the total energy expenditure of the world. As briefly discussed later, there are many different contributors to the retarding force in friction, ranging from asperity deformation to the generation of charges and changes in local structure. When two bodies in contact move relative to each other, due to these various ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Martensitic
Martensite is a very hard form of steel crystalline structure. It is named after German metallurgist Adolf Martens. By analogy the term can also refer to any crystal structure that is formed by diffusionless transformation. Properties Martensite is formed in carbon steels by the rapid cooling (quenching) of the austenite form of iron at such a high rate that carbon atoms do not have time to diffuse out of the crystal structure in large enough quantities to form cementite (Fe3C). Austenite is gamma-phase iron (γ-Fe), a solid solution of iron and alloying elements. As a result of the quenching, the face-centered cubic austenite transforms to a highly strained body-centered tetragonal form called martensite that is supersaturated with carbon. The shear deformations that result produce a large number of dislocations, which is a primary strengthening mechanism of steels. The highest hardness of a pearlitic steel is 400 Brinell, whereas martensite can achieve 700 Br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Traction Control System
A traction control system (TCS), is typically (but not necessarily) a secondary function of the electronic stability control (ESC) on production motor vehicles, designed to prevent loss of traction (i.e., wheelspin) of the driven road wheels. TCS is activated when throttle input and engine power and torque transfer are mismatched to the road surface conditions. The intervention consists of one or more of the following: *Brake force applied to one or more wheels *Reduction or suppression of spark sequence to one or more cylinders *Reduction of fuel supply to one or more cylinders *Closing the throttle, if the vehicle is fitted with drive by wire throttle *In turbocharged vehicles, a boost control solenoid is actuated to reduce boost and therefore engine power. Typically, traction control systems share the electrohydraulic brake actuator (which does not use the conventional master cylinder and servo) and wheel-speed sensors with ABS. The basic idea behind the need for a tract ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
