|
Cwm-Pandy Quarry
Brynglas railway station (also known as Bryn-glas railway station) is a request stop on the Talyllyn Railway, serving the hamlet of Pandy near Bryn-crug, in Gwynedd, Mid-Wales. It is from . A station building and platform are provided on the north side of the track, as the railway's carriages have been modified to have doors only on this side for safety reasons. The station building is a Grade II listed structure. The name 'Brynglas' was taken from a local farm, and means 'Blue hill'. There are level crossings on both sides of the station: one to the east, for a farm track, and on to the west, for the public road to Pandy. The road crossing was originally a brick arch bridge, which now serves as a cattle creep. There is also a bridge over the Afon Cwm-Pandy. The station was originally situated between the two bridges, but the platform has since been extended in both directions such that it now stretches between both level crossings. The river bridge was rebuilt to carry the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heritage Railway
A heritage railway or heritage railroad (US usage) is a railway operated as living history to re-create or preserve railway scenes of the past. Heritage railways are often old railway lines preserved in a state depicting a period (or periods) in the history of rail transport. Definition The British Office of Rail and Road defines heritage railways as follows:...'lines of local interest', museum railways or tourist railways that have retained or assumed the character and appearance and operating practices of railways of former times. Several lines that operate in isolation provide genuine transport facilities, providing community links. Most lines constitute tourist or educational attractions in their own right. Much of the rolling stock and other equipment used on these systems is original and is of historic value in its own right. Many systems aim to replicate both the look and operating practices of historic former railways companies. Infrastructure Heritage railway lines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Settlement (structural)
Settlement in a structure refers to the distortion or disruption of parts of a building due to * unequal compression of its foundations; * shrinkage, such as that which occurs in timber-framed buildings as the frame adjusts its moisture content; or * undue loads being applied to the building after its initial construction. Settlement should not be confused with subsidence which results from the load-bearing ground upon which a building sits reducing in level, for instance in areas of mine workings where shafts collapse underground. Some settlement is quite normal after construction has been completed, but unequal or differential settlement may cause significant problems for buildings. Traditional green oak-framed buildings are designed to settle with time as the oak seasons and warps, lime mortar rather than Portland cement is used for its elastic properties and glazing will often employ small leaded lights which can accept movement more readily than larger panes. See also * Soi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Signalling Block System
Signalling block systems enable the safe and efficient operation of railways by preventing collisions between trains. The basic principle is that a track is broken up into a series of sections or "blocks". Only one train may occupy a block at a time, and the blocks are sized to allow a train to stop within them. That ensures that a train always has time to stop before getting dangerously close to another train on the same line. The block system is referred to in the UK as the ''method of working'', in the US as the ''method of operation'', and in Australia as ''safeworking''. In most situations, a system of signals is used to control the passage of trains between the blocks. When a train enters a block, signals at both ends change to indicate that the block is occupied, typically using red lamps or indicator flags. When a train first enters a block, the rear of the same train has not yet left the previous block, so both blocks are marked as occupied. That ensures there is slight ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Token (railway Signalling)
In railway signalling, a token is a physical object which a train driver is required to have or see before entering onto a particular section of single track. The token is clearly endorsed with the names of the section it belongs to. A token system is more commonly used for single lines because of the greater risk of collision in the event of a mistake being made by a signaller or traincrew, than on double lines. Principle The operation of a bidirectional single track line has the hazard of two trains colliding. The simplest way to prevent such collisions is to have only one train in the section at any given time. Such a system is known as "one-engine-in-steam” (OES) or “one-train working" (OTW). This system is used on some branches of rail networks, and on heritage railways. The main disadvantage is that it restricts the number of train movements that can be made. For a larger railway system, it becomes exceptionally limiting in the level of operations that it allows, wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ground Frame
Mechanical railway signalling installations rely on lever frames for their operation to interlock the signals, track locks and points to allow the safe operation of trains in the area the signals control. Usually located in the signal box, the levers are operated either by the signalman or the pointsman. The world's largest lever frame is believed to have been in the Spencer Street No.1 signal box in Melbourne, Australia, which had 191 levers, but was decommissioned in 2008. The largest, currently operational, lever frame is located at Severn Bridge Junction in Shrewsbury, England, and has 180 levers; although most of them have now been taken out of use. Overview The lever frame is located in the signal box, which can be a building at ground level or a tower, separated from or connected to an existing station building. Early lever frames were also built as ''ground frames'' next to the track, without any form of shelter and were usually operated by traincrew and not per ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Passing Loop
A passing loop (UK usage) or passing siding (North America) (also called a crossing loop, crossing place, refuge loop or, colloquially, a hole) is a place on a single line railway or tramway, often located at or near a station, where trains or trams travelling in opposite directions can pass each other. Trains/trams going in the same direction can also overtake, provided that the signalling arrangement allows it. A passing loop is double-ended and connected to the main track at both ends, though a dead end siding known as a refuge siding, which is much less convenient, can be used. A similar arrangement is used on the gauntlet track of cable railways and funiculars, and in passing places on single-track roads. Ideally, the loop should be longer than all trains needing to cross at that point. Unless the loop is of sufficient length to be dynamic, the first train to arrive must stop or move very slowly, while the second to arrive may pass at speed. If one train is too long for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Siding (rail)
A siding, in rail terminology, is a low-speed track section distinct from a running line or through route such as a main line, branch line, or spur. It may connect to through track or to other sidings at either end. Sidings often have lighter rails, meant for lower speed or less heavy traffic, and few, if any, signals. Sidings connected at both ends to a running line are commonly known as loops; those not so connected may be referred to as single-ended or dead-end sidings, or (if short) stubs. Functions Sidings may be used for marshalling (classifying), stabling, storing, loading, and unloading vehicles. Common sidings store stationary rolling stock, especially for loading and unloading. Industrial sidings (also known as spurs) go to factories, mines, quarries, wharves, warehouses, some of them are essentially links to industrial railways. Such sidings can sometimes be found at stations for public use; in American usage these are referred to as team tracks (after the use ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stone Slab
A stone slab is a big stone, flat and relatively thin, often of rectangular or almost rectangular form. They are generally used for paving floors, for covering walls or as headstones. In dolmens Most dolmen constructions were built using stone slabs of big dimensions. Their architecture often includes a corridor of access that can be constructed using stone slabs or dry stones. The burial chamber, with variable shapes (e.g. rectangular, polygonal, oval, circular) can also be preceded by an anteroom. In some dolmens, the entrance has a door cut into one or more vertical stone slabs. In construction The main applications of the slabs as material of construction are for pavings and in the construction of roofs. They can be employed for other uses, among them: * Balconies formed from a slab * Dry stone constructions of: walls, caves, rooms. * The base of some fireplaces are built with stone slabs (a big one or some smaller together). * In religious altars, the ''altar stone'' ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Railway And Canal Historical Society
The Railway and Canal Historical Society was founded in the United Kingdom in 1954 to bring together all those interested in the history of transport, with particular reference to railways and waterways in Britain, its main objects being to promote historical research and to raise the standard of published history. Activities As the activities of the society increased, a more formal structure was needed, and it registered with Companies House on 14 November 1967 as a private company limited by guarantee with no share capital. The ''Journal of the Railway and Canal Historical Society'', containing the results of original research, has been produced regularly since 1955. The Society also has a book publishing programme and aims to raise publishing standards by rewarding excellence. This has been achieved since 2004 by an annual awards ceremony, in which authors of leading works in the areas of railways, canals and transport are recognised. Winners receive a certificate, a silver c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bradshaw's Guide
''Bradshaw's'' was a series of railway Public transport timetable, timetables and travel guide books published by W.J. Adams and later Henry Blacklock, both of London. They are named after founder George Bradshaw, who produced his first timetable in October 1839. Although Bradshaw died in 1853, the range of titles bearing his name (and commonly referred to by that alone) continued to expand for the remainder of the 19th and early part of the 20th century, covering at various times Continental Europe, India, Australia and New Zealand, as well as parts of the Middle-East. They survived until May 1961, when the final monthly edition of the British guide was produced. The British and Continental guides were referred to extensively by presenter Michael Portillo in his multiple television series. Early history Bradshaw's name was already known as the publisher of ''Bradshaw's Maps of Inland Navigation'', which detailed the canals of Lancashire and Yorkshire, when, on 19 October 1839 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Abutments
An abutment is the substructure at the ends of a bridge span or dam supporting its superstructure. Single-span bridges have abutments at each end which provide vertical and lateral support for the span, as well as acting as retaining walls to resist lateral movement of the earthen fill of the bridge approach. Multi-span bridges require piers to support ends of spans unsupported by abutments. Dam abutments are generally the sides of a valley or gorge, but may be artificial in order to support arch dams such as Kurobe Dam in Japan. The civil engineering term may also refer to the structure supporting one side of an arch, or masonry used to resist the lateral forces of a vault.Pevsner, N. (1970) ''Cornwall''; 2nd ed. Harmondsworth: Penguin; p. 245 The impost or abacus of a column in classical architecture may also serve as an abutment to an arch. The word derives from the verb "abut", meaning to "touch by means of a mutual border". Use in engineering An abutment may be us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
I-beam
An I-beam, also known as H-beam (for universal column, UC), w-beam (for "wide flange"), universal beam (UB), rolled steel joist (RSJ), or double-T (especially in Polish language, Polish, Bulgarian language, Bulgarian, Spanish language, Spanish, Italian language, Italian and German language, German), is a beam (structure), beam with an or -shaped cross section (geometry), cross-section. The horizontal elements of the are flanges, and the vertical element is the "web". I-beams are usually made of structural steel and are used in construction and civil engineering. The web resists shear forces, while the flanges resist most of the bending moment experienced by the beam. The Euler–Bernoulli beam equation shows that the I-shaped section is a very efficient form for carrying both bending and shearing (physics), shear loads in the plane of the web. On the other hand, the cross-section has a reduced capacity in the transverse direction, and is also inefficient in carrying torsion ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Siding (rail)")
