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British Rail Class 142
The British Rail Class 142 Pacer were diesel multiple units built for British Rail (BR) from 1985 to 1987. The class were built with a high level of commonality with the widely-used Leyland National bus. They are part of the Pacer family of railbuses. The last set was withdrawn from service in 2020. Background By the beginning of the 1980s, British Rail (BR) operated a large fleet of first-generation DMUs, which had been constructed in prior decades to various designs. While formulating its long-term strategy for this sector of its operations, British Rail planners recognised that considerable costs would be incurred by undertaking refurbishment programmes necessary for the continued use of these ageing multiple units, particularly due to the necessity of handling and removing hazardous materials such as asbestos. In the light of the high costs involved in retention, planners examined the prospects for the development and introduction of a new generation of DMUs to succeed t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
KeolisAmey Wales
Keolis Amey Operations ( cy, Gweithrediadau KeolisAmey), Full legal name is bilingual including the Welsh name, as "Keolis Amey Operations / Gweithrediadau Keolis Amey Limited". trading as Transport for Wales Rail Services (TfW Rail Services) was a Welsh train operating company owned by Keolis (60%) and Amey (40%) that operated the Wales & Borders franchise between October 2018 and February 2021. The Welsh Government body Transport for Wales awarded the contract for the Wales and Borders franchise to KeolisAmey in 2018 which commenced rail operations on 14 October 2018. KeolisAmey used the brand names Transport for Wales and TfW Rail ( cy, Trafnidiaeth Cymru and ), which are owned by the Welsh Government, for day-to-day operations. The Welsh Government nationalised the franchise on 7 February 2021, transferring operations to Transport for Wales Rail, although KeolisAmey continues to provide an infrastructural role in the franchise. History In October 2016 four bids were sh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Train Protection & Warning 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. The British Rail Safety and Standards Board's definition is: 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 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 it before the poi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Iron
Iron () is a chemical element with symbol Fe (from la, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in front of oxygen (32.1% and 30.1%, respectively), forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust. In its metallic state, iron is rare in the Earth's crust, limited mainly to deposition by meteorites. Iron ores, by contrast, are among the most abundant in the Earth's crust, although extracting usable metal from them requires kilns or furnaces capable of reaching or higher, about higher than that required to smelt copper. Humans started to master that process in Eurasia during the 2nd millennium BCE and the use of iron tools and weapons began to displace copper alloys, in some regions, only around 1200 BCE. That event is considered the transition from the Bronze Age to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Composite Material
A composite material (also called a composition material or shortened to composite, which is the common name) is a material which is produced from two or more constituent materials. These constituent materials have notably dissimilar chemical or physical properties and are merged to create a material with properties unlike the individual elements. Within the finished structure, the individual elements remain separate and distinct, distinguishing composites from mixtures and solid solutions. Typical Materials, engineered composite materials include: *Reinforced concrete and masonry *Composite wood such as plywood *Reinforced plastics, such as fibre-reinforced polymer or fiberglass *Ceramic matrix composites (composite armor, composite ceramic and metal matrices) *Metal matrix composites *and other Advanced composite materials (engineering), advanced composite materials There are various reasons where new material can be favoured. Typical examples include materials which are less ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Track Circuit
A track circuit is an electrical device used to prove the absence of a train on rail tracks to signallers and control relevant signals. An alternative to track circuits are axle counters. Principles and operation The basic principle behind the track circuit lies in the connection of the two rails by the wheels and axle of locomotives and rolling stock to short an electrical circuit. This circuit is monitored by electrical equipment to detect the absence of the trains. Since this is a safety appliance, fail-safe operation is crucial. Hence the circuit is designed to indicate the presence of a train when failures occur. On the other hand, false occupancy readings are disruptive to railway operations and must be minimized. Track circuits allow railway signalling systems to operate semi-automatically, by displaying signals for trains to slow or stop in the presence of occupied track ahead of them. They help prevent Train dispatcher, dispatchers and Manual block, operators from ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Rail Class 140
The British Rail Class 140 was the prototype of the ''Pacer'' diesel multiple unit. It was constructed between 1979 and 1981 in response to a desire within British Rail to develop a capable railbus for its smaller branch line services. Much of the bodywork was constructed using Leyland National bus components, with the exception of the cabs. Based on the single car railbus prototypes, the Class 140 was built to BR's then stringent regulations regarding crashworthiness and resistance to end loading; as such, much of its intention lightweight 'bus on a wagon' look was lost, becoming a more substantial vehicle. Throughout the 1980s, the sole member of the class functioned as a trials and demonstration unit, acting as a herald to the closely-related Class 141. Since its withdrawal, the unit has been preserved at the Keith and Dufftown Railway. Background By the beginning of the 1980s, British Rail (BR) operated a large fleet of first generation DMUs, which had been constructed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Rail Class 151
The British Rail Class 151 was a prototype class of diesel multiple unit (DMU) developed and constructed by the British railway equipment manufacturer Metro Cammell. It was designed primarily to serve as a successor to the earlier first-generation "Heritage" DMUs operated by the British Rail (BR). Development of the Class 151 commenced during 1983 in response to a specification issued by BR calling for a new generation of DMU with which to equip its fleet. Both Metro Cammell and British Rail Engineering Limited (BREL) were selected to produce prototypes of their design submissions. Accordingly, a pair of 3-car units were constructed, which entered trial service with BR during 1985. If it had emerged successful, the Class 151 would have likely become the basis of ''Sprinter'' family of DMUs that were produced during the 1980s. However, following a competitive evaluation against the rival Class 150, the type did not secure a production contract, having lost out to its BREL-buil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asbestos
Asbestos () is a naturally occurring fibrous silicate mineral. There are six types, all of which are composed of long and thin fibrous crystals, each fibre being composed of many microscopic "fibrils" that can be released into the atmosphere by abrasion and other processes. Inhalation of asbestos fibres can lead to various dangerous lung conditions, including mesothelioma, asbestosis, and lung cancer, so it is now notorious as a serious health and safety hazard. Archaeological studies have found evidence of asbestos being used as far back as the Stone Age to strengthen ceramic pots, but large-scale mining began at the end of the 19th century when manufacturers and builders began using asbestos for its desirable physical properties. Asbestos is an excellent electrical insulator and is highly fire-resistant, so for much of the 20th century it was very commonly used across the world as a building material, until its adverse effects on human health were more widely acknowl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of British Rail Diesel Multiple Unit Classes
This is a list of British Rail diesel multiple-unit train classes. For a historical overview of diesel multiple unit train development in Great Britain, see British railcars and diesel multiple units. Pre-nationalisation designs * GWR railcars * LMS railcars First Generation Early BR DMUs (79xxx series) TOPS classes Second generation Lightweight railcars Pacers Sprinters Turbos Networker Turbostar Coradias Desiro Civity Diesel-electric multiple units (DEMUs) Southern Region DEMUs Second Generation Voyager-style express DEMUs High-speed trains See also * List of British Rail electric multiple unit classes * British Rail locomotive and multiple unit numbering and classification * British Rail coach type codes British Railways coach designations were a series of letter-codes used to identify different types of coaches, both passenger carrying and non-passenger carrying stock (NPCS). The code was generally painted on the end of the coach but no ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Leyland National
The Leyland National is an integrally-constructed British step-floor single-decker bus manufactured in large quantities between 1972 and 1985. It was developed as a joint project between two UK nationalised industries – the National Bus Company and British Leyland. Buses were constructed at a specially built factory at the Lillyhall Industrial Estate, Workington. Styling was carried out by the Italian vehicle stylist Giovanni Michelotti, previously commissioned by both Triumph (Herald, TR4, GT6, 2000/2500, 1300, Dolomite and Stag) and Scammell lorries (Routeman GRP cab). It was intended to replace all the rear-engined single-decker buses offered by British Leyland, including the AEC Swift, Bristol RE, single-deck Daimler Fleetline, Daimler Roadliner and Leyland Panther. Design The Leyland National was built with integral, modular construction and a rear engine. All components were designed for ease of construction and replacement. Until 1978, it was always b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Rail
British Railways (BR), which from 1965 traded as British Rail, was a state-owned company that operated most of the overground rail transport in Great Britain from 1948 to 1997. It was formed from the nationalisation of the Big Four (British railway companies), Big Four British railway companies, and was privatisation of British Rail, privatised in stages between 1994 and 1997. Originally a trading brand of the Railway Executive of the British Transport Commission, it became an independent statutory corporation in January 1963, when it was formally renamed the British Railways Board. The period of nationalisation saw sweeping changes in the railway. A process of dieselisation and Railway electrification in Great Britain, electrification took place, and by 1968 steam locomotives had been entirely replaced by diesel and electric traction, except for the Vale of Rheidol Railway (a narrow-gauge railway, narrow-gauge tourist line). Passenger train, Passengers replaced freight train, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Diesel Multiple Unit
A diesel multiple unit or DMU is a multiple-unit train powered by on-board diesel engines. A DMU requires no separate locomotive, as the engines are incorporated into one or more of the carriages. Diesel-powered single-unit railcars are also generally classed as DMUs. Diesel-powered units may be further classified by their transmission type: diesel–mechanical DMMU, diesel–hydraulic DHMU, or diesel–electric DEMU. Design The diesel engine may be located above the frame in an engine bay or under the floor. Driving controls can be at both ends, on one end, or in a separate car. Types by transmission DMUs are usually classified by the method of transmitting motive power to their wheels. Diesel–mechanical In a diesel–mechanical multiple unit (DMMU), the rotating energy of the engine is transmitted via a gearbox and driveshaft directly to the wheels of the train, like a car. The transmissions can be shifted manually by the driver, as in the great majority of first-ge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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