A Rail profile is a hot rolled steel profile of a specific shape or cross section (an asymmetrical I-beam) designed for use as the fundamental component of railway track. Hot rolling is a Metalworking process where large pieces of Metal, such as slabs or billets are heated above their Recrystallization temperature and Steel is an Alloy consisting mostly of Iron, with a Carbon content between 0 Structural steel is Steel construction Material, a profile, formed with a specific Shape or cross section and certain standards of The shape ( OE sceap Eng created thing) of an object located in some space refers to the part of space occupied by the object as determined In Geometry, a cross section is the intersection of a body in 2-dimensional space with a line or of a body in 3-dimensional space with a plane etc I-beams (also known as W-beams or double-T esp in Polish and German) are beams with an I- or H-shaped
Unlike some other uses of iron and steel, railway rails are subject to very high stresses and have to be made of very high quality steel. Iron (ˈаɪɚn is a Chemical element with the symbol Fe (ferrum and Atomic number 26 Steel is an Alloy consisting mostly of Iron, with a Carbon content between 0 It took many decades to improve the quality of the materials, including the change from iron to steel. Minor flaws in the steel that pose no problems in reinforcing rods for buildings, can, however, lead to broken rails and dangerous derailments when used on railway tracks. A derailment is an accident on a railway in which a Train leaves the rails which can result in damage injury and death
By and large, the heavier the rails and the rest of the trackwork, the heavier and faster the trains these tracks can carry. A train is a connected series of vehicles that move along a track ( Permanent way) to transport freight or passengers from one place to another
The rails represent a substantial fraction of the cost of a railway line. Only a small number of rail sizes are made by the steelworks at the one time, so a railway must choose the nearest suitable size. Worn, heavy rail from a mainline is often reclaimed and downgraded for re-use on a branchline, siding or yard. A branch line is a secondary railway line which branches off a more important through route usually a main line. A siding, in Rail terminology, is a track section distinct from a through route such as a main line or Branch line or spur A ( US and Canada) classification yard or ( UK and Canada) marshalling yard (including hump yards) is a Railroad
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Rail sizes
Pound is a railroad term that indicates the weight of rail per yard. The Nationale Maatschappij der Belgische Spoorwegen (NMBS Dutch) or Société Nationale des Chemins de fer Belges (SNCB French) is the Belgian "Railroad" and "Railway" both redirect here For other uses see Railroad (disambiguation. A yard (abbreviation yd) is a unit of Length in several different systems including English units Imperial units and United For example one yard of "132 pound rail" weighs 132 pounds. Depending on the use of imperial or metric units, rail sizes are usually expressed in terms of pounds per yard or kilograms per metre. Imperial units or the Imperial system is a collection of units first defined in the British Weights and Measures Act of 1824 The metric system is a decimalised system of measurement. It exists in several variations with different choices of base units, though the choice of base units does Coincidentally, the pounds-per-yard figure is almost exactly double the kilograms-per-metre figure, making rough conversions easy. Rails in Canada, the United Kingdom, and United States are still described using imperial units. Country to "Dominion of Canada" or "Canadian Federation" or anything else please read the Talk Page The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom, the UK or Britain,is a Sovereign state located The United States of America —commonly referred to as the However, in Australia they are now described in metric units and always have been on mainland Europe. For a topic outline on this subject see List of basic Australia topics. Continental Europe, also referred to as mainland Europe or simply the Continent, is the Continent of Europe, explicitly excluding European
Europe
Rails are made in a large number of different sizes. Some common European rail sizes include:
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In the countries of former USSR 65 kg/m rails are common. The post-Soviet states, also commonly known as former Soviet republics, are the 15 independent nations that split off from the Union of Soviet Socialist Republics Thermally hardened 75 kg/m rails also have been used on heavy-duty railroads like Baikal-Amur Mainline, but have proven themselves deficient in operation and were mainly rejected in favor of 65 kg/m rails[1]. The Baikal-Amur Mainline ( Russian Байкало-Амурская Магистраль Baikalo-Amurskaya Magistral’, BAM) is a Railway line
North America
The American Society of Civil Engineers (or ASCE) specified rail profiles in 1893 for 5 pound increments from 40 to 100 pounds per yard. ASCE tee-rail profiles specified fixed proportions -- height of rail equaled width of foot and proportion of weight in head, web and foot were 42%, 21% and 37%, respectively. ASCE 90 pound profile was adequate; but heavier weights were less satisfactory. In 1909 the American Railway Association (or ARA) specified standard profiles for 10 pound increments from 60 to 100 pounds per yard. The American Railway Association ( ARA) was an industry trade group representing railroads in the United States. The American Railway Engineering Association (or AREA) specified standard profiles for 100, 110 and 120 pound rails in 1919, for 130 and 140 pound rails in 1920, and for 150 pound rails in 1924. The trend was to increase rail height/foot-width ratio and strengthen the web. Disadvantages of the narrower foot were overcome through use of tie-plates. AREA recommendations reduced the relative weight of rail head down to 36%, while alternative profiles reduced head weight to 33% in heavier weight rails. Attention was also focused on improved fillet radii to reduce stress concentration at the web junction with the head. AREA recommended the ARA 90 pound profile. [2] Old ASCE rails of lighter weight remained in use, and satisfied the limited demand for light rail for a few decades. AREA merged into the American Railway Engineering and Maintenance-of-Way Association in 1997. The American Railway Engineering and Maintenance-of-Way Association (AREMA is a North American railway industry group By the mid-20th century, most rail production was medium heavy (112 to 119 pound) and heavy (127 to 140 pound. ) Sizes under 100 pound rail are usually for lighter duty freight, low use trackage, or light rail. For specific light rail systems many of which use the words "light rail" as part of their name see List of light-rail transit systems. Track using 100 to 120 pound rail is for lower speed freight branch lines or rapid transit (for example, most of the New York City Subway system track is constructed with 100 pound rail). A branch line is a secondary railway line which branches off a more important through route usually a main line. A rapid transit, underground, subway, elevated railway or metro(politan system is an electric passenger railway The New York City Subway is a Rapid transit system owned by the City of New York and leased to the New York City Transit Authority, a subsidiary agency Main line track is usually built with 130 pound rail or heavier. Some common North American rail sizes include:[3]
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Some common North American crane rail sizes include:
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Australia
Some common Australian rail sizes include:
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- 50 kg and 60 kg are the current standard, although some other sizes are still manufactured. The New York Central Railroad, known simply as the New York Central in its publicity was a Railroad operating in the Northeastern United States. The Colorado Fuel and Iron Company (CF&I was a large steel concern The New York Central Railroad, known simply as the New York Central in its publicity was a Railroad operating in the Northeastern United States. The Colorado Fuel and Iron Company (CF&I was a large steel concern The Pennsylvania Railroad was an American Railroad, founded in 1846
- Some American sizes are used on northwest Western Australian iron ore railways. Western Australia is a state occupying the entire western third of the Australian continent. Iron ores are rocks and Minerals from which Metallic Iron can be economically extracted
History
Early rails were used on horse drawn wagonways, initially using strap-iron rails, which consisted of thin strips of iron strapped onto wooden rails. Wagonways are the horses equipment and tracks used for hauling wagons which preceded steam powered railways There are two styles of waggonway and two spellings [4] These rails were too fragile to carry heavy loads, but because the initial construction cost was less, this method was sometimes used to quickly build an inexpensive rail line. Strap rails sometimes separated from the wooden base and speared into the floor of the carriages above, creating what was referred to as a "snake head. " However, the long-term expense involved in frequent maintenance outweighed any savings.
These were superseded by cast iron rails which were flanged (i. e 'L' shaped) with the wagon wheels being flat, an early exponent being Benjamin Outram. Benjamin Outram ( 1 April 1764 - 22 May 1805) was an English Civil engineer, surveyor and industrialist His partner William Jessop had pioneered the use of "edge rails" in 1789 where the wheels were flanged and, over time it was realised that these worked better. William Jessop ( 23 January 1745 - 18 November 1814) was a noted English Civil engineer, particularly famed for his work
The earliest of these in general use were the so-called cast iron fishbelly rails from their shape. Cast iron usually refers to grey cast iron, but identifies a large group of Ferrous Alloys which solidify with a Eutectic. Rails made from cast iron were brittle and broke easily. Cast iron usually refers to grey cast iron, but identifies a large group of Ferrous Alloys which solidify with a Eutectic. They could only be made in short lengths which would soon become uneven. By 1840, wrought iron in longer lengths replaced cast iron as rolling techniques improved. QtubIronPillarJPG|thumb|right| Iron pillar at Delhi India containing 98% wrought iron]] Wrought iron is commercially pure Iron. The cross-section varied widely from one line to another, but were of three basic types as shown in the diagram. The parallel cross-section which developed in later years was referred to as Bullhead.
Meanwhile, in May 1831, the first flanged T rail (also called T-section) arrived in America from Britain and was laid into the Pennsylvania Railroad by Camden and Amboy Railroad. A Rail profile is a Hot rolled Steel profile of a specific Shape or cross section (an asymmetrical I-beam) designed The Pennsylvania Railroad was an American Railroad, founded in 1846 The United New Jersey Railroad and Canal Company was part of the Pennsylvania Railroad system in New Jersey, including their main line to New York City They were also used by Charles Vignoles in Britain. Charles Blacker Vignoles ( 31 May 1793 &ndash 17 November 1875) was an influential early Railway engineer and eponym of the
The first steel rails were made in 1857 by Robert Forester Mushet, who laid them at Derby station in England[5]. Steel is an Alloy consisting mostly of Iron, with a Carbon content between 0 Robert Forester Mushet (1811 – 1891 an English metallurgist, was born April 8 1811 in Coleford Gloucestershire. Derby Midland Station (often called Derby Station) is a main line Railway station serving the city of Derby in England. England is a Country which is part of the United Kingdom. Its inhabitants account for more than 83% of the total UK population whilst its mainland Steel was a much stronger material, which steadily replaced iron for use on railway rail and allowed much longer lengths of rails to be rolled.
The American Railway Engineering Association (AREA) and the American Society for Testing Materials (ASTM) specified carbon, manganese, silicon and phosphorus content for steel rails. ASTM International ( ASTM) originally known as the American Society for Testing and Materials is an international Standards organization that develops and publishes Tensile strength increases with carbon content, while ductility decreases. AREA and ASTM specified 0. 55 to 0. 77 percent carbon in 70 to 90 pound rail, 0. 67 to 0. 80 percent in rail weights from 90 to 120 pounds, and 0. 69 to 0. 82 percent for heavier rails. Manganese increases strength and resistance to abrasion. AREA and ASTM specified 0. 6 to 0. 9 percent manganese in 70 to 90 pound rail and 0. 7 to 1 percent in heavier rails. Silicon improves steel by increasing density. AREA and ASTM specified 0. 1 to 0. 23 percent silicon. Phosphorus and sulfur are impurities causing brittle rail with reduced impact-resistance. AREA and ASTM specified maximum phosphorus concentration of 0. 04 percent. [6]
The use of welded rather than jointed track began in around the 1940s and had become widespread by the 1960s.
Axleloads and speeds
Rail weights are very important in determining axleloads and speeds. The axleload is the weight bearing upon the track or road by a rail or road vehicle
- Railway: Sierra Leone Government Railway
- Rail Weight: 30lb (15km/m)
- Axleload: 5 tons. The Sierra Leone Government Railway operated in the West African country of Sierra Leone from 1897 to 1974 A Rail profile is a Hot rolled Steel profile of a specific Shape or cross section (an asymmetrical I-beam) designed
- Speed: 20mph (32. 2 km/h)
These limits are so low that sharp curves hardly impose any extra speed limits.
- Curve radius: ?
Types
Vignoles rail
Vignoles rail is the popular name of the flat-bottomed rail used internationally for railway track, recognising engineer Charles Vignoles who introduced it to Britain. The London and Croydon Railway was opened in 1839 between London and Croydon in England. The Birmingham and Gloucester Railway is a Railway route linking Birmingham to Gloucester in England. Charles Blacker Vignoles ( 31 May 1793 &ndash 17 November 1875) was an influential early Railway engineer and eponym of the The United Kingdom of Great Britain and Ireland was the formal name of the United Kingdom from 1 January 1801 until 12 April 1927
In late 1830s England, railway lines had a vast range of different patterns. For the game see 1830 (board game. Year 1830 ( MDCCCXXX) was a Common year starting on Friday (link will display England is a Country which is part of the United Kingdom. Its inhabitants account for more than 83% of the total UK population whilst its mainland One of the earliest lines to use double-headed rail was the London and Birmingham Railway, which had offered a prize for the best design. This is about the 19th century railway company For the 21st century train operating company see London Midland The London and Birmingham Railway If it were true that the rail could be turned over when the running surface became worn, the argument lost its validity as it evolved into the bullhead rail, with a heavier profile to the top edge. The lower edge also wore in patches where it was borne on the chairs. Although it became the standard for the British railway system until the mid-20th century, there seems to be nothing in the literature about any other advantages it may have had. The twentieth century of the Common Era began on
Flat bottomed rail was first introduced in America by R.L.Stevens in 1830. The United States of America —commonly referred to as the Colonel Robert Livingston Stevens ( October 18 1787 &ndash April 20 1856 Hoboken New Jersey) was the son of Colonel John Stevens For the game see 1830 (board game. Year 1830 ( MDCCCXXX) was a Common year starting on Friday (link will display There were no steel mills in America capable of rolling long lengths, so it was manufactured in Britain. Charles Vignoles observed that wear was occurring with steel rails and steel chairs upon stone blocks, the normal system at that time. Charles Blacker Vignoles ( 31 May 1793 &ndash 17 November 1875) was an influential early Railway engineer and eponym of the In 1836 he recommended flat-bottomed rail to the London and Croydon Railway for which he was consulting engineer. The London and Croydon Railway was opened in 1839 between London and Croydon in England.
His original rail had a smaller cross-section to the Stevens rail, with a wider base than modern rail, fastened with screws through the base. Other lines which adopted it were the Hull and Selby, the Newcastle and North Shields, and the Manchester, Bolton and Bury Canal Navigation and Railway Company. [7]
When it became possible to preserve wooden sleepers with mercuric chloride (a process called Kyanising) and creosote, they gave a much quieter ride than stone blocks and it was possible to fasten the rails directly using clips or rail spikes. The Hull and Selby Railway was a railway company in the United Kingdom which opened in 1840 connecting Hull with the Leeds and Selby Railway Mercury(II chloride or mercuric chloride (formerly corrosive sublimate) is the Chemical compound with the formula HgCl sub>2 John Howard Kyan (1774-1850 was the inventor of the 'kyanising' process for preserving wood. Creosote is the name used for a variety of products including wood creosote and coal tar creosote. In Rail terminology, a spike is a large nail with an offset head that is used to secure rails or Fishplates (or baseplates to ties in the track Their use spread world-wide and acquired Vignoles' name.
Flanged T rail
Iron-strapped wooden rails were used on all American railways until 1831. Year 1831 ( MDCCCXXXI) was a Common year starting on Saturday (link will display the full calendar of the Gregorian Calendar (or a Col. Robert L. Stevens, the President of the Camden and Amboy Railroad, conceived the idea that an all-iron rail would be better suited for building a railroad. Colonel Robert Livingston Stevens ( October 18 1787 &ndash April 20 1856 Hoboken New Jersey) was the son of Colonel John Stevens The United New Jersey Railroad and Canal Company was part of the Pennsylvania Railroad system in New Jersey, including their main line to New York City He sailed to England which was the only place where his flanged T rail (also called T-section) could be rolled. England is a Country which is part of the United Kingdom. Its inhabitants account for more than 83% of the total UK population whilst its mainland Railways in England had been using rolled rail of other cross-sections which the ironmasters had produced. An ironmaster is the manager &ndash and usually owner &ndash of a Forge or Blast furnace for the processing of Iron.
In May, 1831, the first 500 rails, each 15 feet (4. 57 m) long and weighing 36 pounds per yard (18 kg/m), reached Philadelphia and were placed in the track, marking the first use of the flanged T rail. Philadelphia (ˌfɪləˈdɛlfiə Afterwards, the flanged T rail became employed by all railroads in the United States. The United States of America —commonly referred to as the Col. Stevens also invented the hooked spike for attaching the rail to the crosstie (or sleeper). In Rail terminology, a spike is a large nail with an offset head that is used to secure rails or Fishplates (or baseplates to ties in the track A railroad tie, cross tie, or railway sleeper is a rectangular object used as a base for Railroad tracks. A railroad tie, cross tie, or railway sleeper is a rectangular object used as a base for Railroad tracks. At the present time, the screw spike is being used widely in place of the hooked spike, perhaps because it is possible to install the screw spike by using a labor-saving machine that replaces salaried workers.
At the present time, crossties or sleepers constructed of concrete are in use in some places. The use of creosote as a treatment for wooden crossties has been declared to be detrimental to the health of people and plants. Creosote is the name used for a variety of products including wood creosote and coal tar creosote. The crossties or sleepers are embedded in ballast in order to provide stability and drainage. Track ballast forms the trackbed upon which Railroad ties (US or railway sleepers (UK are laid
The joint where two rails are connected is the weakest part of a rail line. The earliest iron rails were joined by a simple fishplate or bar of metal bolted through the web of the rail. Stronger methods of joining two rails together have been developed. When sufficient metal is put into the rail joint, the joint is almost as strong as the rest of the rail length. The noise generated by trains passing over the rail joints, described as "the clickity clack of the railroad track", can be eliminated by welding the rail sections together forming a continuous rail. One kind of welding is the Thermite welding process. Thermite welding is the process of igniting a mix of high energy materials (which is also called Thermite) that produce a molten metal that is poured between the working pieces
Examples of old methods
 A connector that matches rails of different heights |
 RE130 to RE100 |
 Joined electrically |
 Pennsylvania RR standard joint |
 Not made of solid steel |
 Portec patented substance |
 Three wires |
 Short rail |
 Old fishplate |
 Shorter Pennsylvania RR standard joint |
See also
References
- ^ message in the mailing list '1520mm' on Р75 rails. The Pennsylvania Railroad was an American Railroad, founded in 1846 The Pennsylvania Railroad was an American Railroad, founded in 1846 Structural steel is Steel construction Material, a profile, formed with a specific Shape or cross section and certain standards of Tramway track is used on tramways or Light rail operations Grooved rails (or girder rails are often used in order to make street running feasible "Railroad" and "Railway" both redirect here For other uses see Railroad (disambiguation. Tramway track is used on tramways or Light rail operations Grooved rails (or girder rails are often used in order to make street running feasible Structural steel is Steel construction Material, a profile, formed with a specific Shape or cross section and certain standards of Tramway track is used on tramways or Light rail operations Grooved rails (or girder rails are often used in order to make street running feasible
- ^ Raymond, William G. , The Elements of Railroad Engineering, 5th Edition, John Wiley and Sons, 1937
- ^ Urquhart, Leonard Church, Civil Engineering Handbook, 4th Edition, McGraw-Hill Book Company, 1959
- ^ Bianculli, Anthony J. , Trains and Technology: The American Railroad in the Nineteenth Century, University of Delaware Press, 2002, Chapter 5, "From Strap Iron to High Iron". ISBN 0874138027
- ^ Marshall, John. The Guiness Book of Rail Facts & Feats (1979) ISBN 0 900424 56 7
- ^ Abbett, Robert W. , American Civil Engineering Practice, Volume I, John Wiley and Sons, 1956
- ^ Ransom, P. J. G. , (1990) The Victorian Railway and How it Evolved, London: Heinemann Ltd.
External links
- ThyssenKrupp handbook
- LR55 Track System Full details
- Table of North American tee rail (flat bottom) sections
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