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Ruling Grade
The term ruling grade is usually used as a synonym for "steepest climb" between two points on a railroad. More simply, the steepest grade to be climbed dictates how powerful the motive power (or how light the train) must be in order for the run to be made without assistance. Even if 99% of the line could be run with a low-powered (and inexpensive) locomotive, if at some point on the line there is a steeper gradient than such train would be able to climb, this gradient "rules" that a more powerful locomotive must be used, in spite of it being far too powerful for the rest of the line. This is why special "helper engines" (also dubbed "Bankers") are often stationed near steep grades on otherwise mild tracks. It is cheaper than running a too-powerful locomotive over the entire track mileage just in order to make the grade, especially when multiple trains run over the line each day (to help justify the fixed daily cost of the helper operation). In the 1953 edition of ''Railway Engineer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grade (slope)
The grade (also called slope, incline, gradient, mainfall, pitch or rise) of a physical feature, landform or constructed line refers to the tangent of the angle of that surface to the horizontal. It is a special case of the slope, where zero indicates horizontality. A larger number indicates higher or steeper degree of "tilt". Often slope is calculated as a ratio of "rise" to "run", or as a fraction ("rise over run") in which ''run'' is the horizontal distance (not the distance along the slope) and ''rise'' is the vertical distance. Slopes of existing physical features such as canyons and hillsides, stream and river banks and beds are often described as grades, but typically grades are used for human-made surfaces such as roads, landscape grading, roof pitches, railroads, aqueducts, and pedestrian or bicycle routes. The grade may refer to the longitudinal slope or the perpendicular cross slope. Nomenclature There are several ways to express slope: # as an ''angle'' of inc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shap
Shap is a linear village and civil parish located among fells and isolated dales in Eden district, Cumbria, England, in the historic county of Westmorland. The parish had a population of 1,221 in 2001, increasing slightly to 1,264 at the 2011 Census. Location The village lies along the A6 road and the West Coast Main Line, and is near to the M6 motorway. It is situated from Penrith and about from Kendal. Shap is on the route of the Coast to Coast Walk. Etymology Early (12th and 13th century) forms such as ''Hep'' and ''Yheppe'' point to an Old Norse rendering ''Hjáp'' of an Old English original ''Hēap'' = "heap", (of stones), probably referring to an ancient stone circle, cairn, or to the Shap Stone Avenue just to the west of the village. History Although Shap is geographically a small village, it is legally a market town with a charter dating from the 17th century. The parish was, between 1905 and 1935, administered by an urban district council. At one time, the grani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hillclimbing (railway)
Hillclimbing is a problem faced by railway systems when a load must be carried up an incline. While railways have a great ability to haul very heavy loads, this advantage is only significant when the tracks are fairly level. As soon as the gradients increase, the tonnage that can be hauled is greatly diminished. History Early tramways and railways were laid out with very gentle grades because locomotive and horse haulage were so low in tractive effort. The only exception would be with a line that was downhill all the way for loaded traffic. Brakes were very primitive at this early stage. Where a railway has to cross a range of mountains, it is important to lower the summit as much as possible, as this reduces the steepness of the gradients on either side. This can be done with a summit tunnel or a deep summit cutting. A summit tunnel can lower the summit even more, and steeper hills result in shorter tunnels. Also, tunnels cost the same no matter how much overburden there is, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Woodhead Tunnel
The Woodhead Tunnels are three parallel trans- Pennine long railway tunnels on the Woodhead Line, a former major rail link from Manchester to Sheffield in Northern England. The western portals of the tunnels are at Woodhead in Derbyshire and the eastern portals are at Dunford Bridge, near Penistone, South Yorkshire. The first tunnel, Woodhead 1 was constructed by the Sheffield, Ashton-under-Lyne and Manchester Railway. Work on the tunnel commenced in 1837. It was designed by the railway engineer Charles Vignoles, who was later substituted by the civil engineer Joseph Locke. When opened in 1845, Woodhead 1 was one of the world's longest railway tunnels and the first trans-Pennine tunnel. Woodhead 2 was completed in 1853. Both tunnels were difficult to maintain because of their narrowness and heavy traffic, estimated to be around 250 trains per day in either direction. As both tunnels were too narrow to allow for electrification, it was decided to construct a third tunnel in th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Double Track
A double-track railway usually involves running one track in each direction, compared to a single-track railway where trains in both directions share the same track. Overview In the earliest days of railways in the United Kingdom, most lines were built as double-track because of the difficulty of co-ordinating operations before the invention of the telegraph. The lines also tended to be busy enough to be beyond the capacity of a single track. In the early days the Board of Trade did not consider any single-track railway line to be complete. In the earliest days of railways in the United States most lines were built as single-track for reasons of cost, and very inefficient timetable working systems were used to prevent head-on collisions on single lines. This improved with the development of the telegraph and the train order system. Operation Handedness In any given country, rail traffic generally runs to one side of a double-track line, not always the same side a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Connaught Tunnel
The Connaught Tunnel is in southeastern British Columbia, on the Revelstoke–Donald segment. The tunnel carries the Canadian Pacific Railway (CP) main line under Mount Macdonald in the Selkirk Mountains, replacing the previous routing over Rogers Pass. History Summit route deficiencies Traffic restrictions imposed by a single track comprising of 2.2 percent gradients, emerging competition, and snow-related costs, were negative factors. The 1910 Rogers Pass avalanche, and other avalanches on the pass, influenced, but did not unduly pressure CP to consider alternatives. However, snow clearing and maintaining snow sheds was an ongoing burden. Rarely assigning more than one pusher locomotive per train, trains over 1,016 tons had to be cut. Higher capacity locomotives had helped, but the next leap forward would not occur until the Selkirk locomotives emerged in 1929. In 1912, the average eight trains (peaking at 11) per day in each direction, were forecast to double over the nex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Box Tunnel
Box Tunnel passes through Box Hill on the Great Western Main Line (GWML) between Bath and Chippenham. The tunnel was the world's longest railway tunnel when it was completed in 1841. Built between December 1838 and June 1841 for the Great Western Railway (GWR) under the direction of Isambard Kingdom Brunel, the straight tunnel descends on a 1 in 100 gradient from its eastern end. At the time the tunnel's construction was considered dangerous due to its length and the composition of the underlying strata. The west portal is Grade II* listed and the east portal is Grade II listed. Ammunition was stored near the tunnel during World War II, reusing mine workings. During the 2010s, the tunnel was modified and the track lowered to prepare it for electrification. History Background During the 1830s, Isambard Kingdom Brunel developed a plan for a railway running east–west between London and Bristol. The Great Western Main Line, would maintain either level ground or gentle gradien ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dove Holes Tunnel
Dove Holes Tunnel is a tunnel built by the Midland Railway between Peak Forest Signal Box and Chapel-en-le-Frith in Derbyshire in 1860–64, now carrying the Great Rocks Line. In the mid-nineteenth century, the Manchester, Buxton, Matlock and Midlands Junction Railway was jointly leased by the LNWR and Midland Railway, and ran as far as Rowsley. The Midland wished to extend to Manchester to give it a service to London but the LNWR, having its own London line, declined. It then supported the Stockport, Disley and Whaley Bridge Railway in building a line from Whaley Bridge to Buxton, one which the Midland considered unsuitable as a main line, due to its steep gradients over Cow Low. In the end, however, the Midland came to an agreement with the Manchester, Sheffield and Lincolnshire Railway that was formalised as the Sheffield and Midland Railway Companies' Committee. The Midland would extend its line to New Mills to meet a line the MS&LR was building from its main line out of M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Combe Down Tunnel
Combe Down Tunnel is on the now-closed Somerset and Dorset Joint Railway main line, between Midford and Bath Green Park railway station, below high ground and the southern suburbs of Bath, England, emerging below the southern slopes of Combe Down village. Opened in 1874, this long disused railway tunnel was once the UK's longest without intermediate ventilation. The tunnel now forms part of the £1.8 million Two Tunnels Greenway walking and cycling path opened on 6 April 2013 and is the longest cycling tunnel in Britain. Its custodian is Wessex Water. Overview The tunnel was on the "Bath Extension" line of the Somerset & Dorset Railway, built in 1874. The extension effectively bankrupted the independent company. The extension line was later made double-track northwards from Evercreech Junction to the viaduct at Midford, but the substantial civil engineering works associated with the tunnel and the steep approach into Bath, including the shorter Devonshire Tunnel, cause ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Devonshire Tunnel
Devonshire Tunnel is on the closed Somerset & Dorset Joint Railway main line, between Midford and Bath Green Park railway stations, below high ground and the southern suburbs of Bath, England, emerging below the northern slopes of Combe Down village. It opened in 1874 and was named after the road called Devonshire Buildings which lie immediately above the tunnel. It now forms one of the eponymous tunnels in the Two Tunnels Greenway. Gradient The tunnel had a gradient of 1 in 50, on a line where the ruling gradient The term ruling grade is usually used as a synonym for "steepest climb" between two points on a railroad. More simply, the steepest grade to be climbed dictates how powerful the motive power (or how light the train) must be in order for the run to ... was also 1 in 50. References * Map sources for: , West portal; , East portal Tunnels completed in 1874 Rail trail tunnels in England Buildings and structures in Bath, Somerset History of Bath, Somerset Tran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swan View Tunnel
The Swan View Tunnel is a former railway tunnel located on the southern side of the Jane Brook valley in the outer Perth suburb of Swan View in the John Forrest National Park on the edge of the Darling Scarp. After its closure as a railway tunnel, it reopened as part of the John Forrest Heritage Trail, a rail trail. Prior to the construction of tunnels and the sinking of the Subiaco railway station in 1999, the Swan View Tunnel was the only tunnel on the Western Australian railway network. Construction Swan View Tunnel was built on an alignment which replaced the original Eastern Railway passing through Smiths Mill, (now Glen Forrest), and Mundaring. The project to build the new line, including the Swan View Tunnel, was managed by the Western Australian Government Railways Engineer-in-Chief, O'Connor. The tunnel was erroneously stated in contemporary reporting to be 13 chains long, which is . Modern authorities give the length as . Inspection of open source aerial image ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Otira Tunnel
The Otira Tunnel is a railway tunnel on the Midland Line in the South Island of New Zealand, between Otira and Arthur's Pass. It runs under the Southern Alps from Arthur's Pass to Otira – a length of over . The gradient is mainly 1 in 33, and the Otira end of the tunnel is over lower than the Arthur's Pass end. Construction Construction commenced in 1907 and a "breakthrough" celebration was held on 21 August 1918 by the Minister of Public Works Sir William Fraser. When the tunnel opened on 4 August 1923, it was the seventh longest tunnel in the world and the longest in the British Empire. The Midland Railway Company investigated alternatives to a long tunnel, but a line over the pass with gradients of 1 in 50 on both sides was not practical. Other options for a line over the pass were a cable-hauled system or a line of 1 in 15 gradient using either the Fell system or a rack railway using the Abt system (or even an S-shaped tunnel under Mount Rolleston). However, the gov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
