A ballastless track or slab track is a type of railway track infrastructure in which the traditional elastic combination of ties/sleepers and ballast is replaced by a rigid construction of concrete or asphalt.
In ballastless tracks, the rails are either discretely supported or continuously supported. Discretely supported rails sit on elastomeric pads and are rigidly fastened to special types of concrete ties/sleepers. These sleepers are themselves set set directly in concrete or in rubber 'boots' and both are then set in concrete. Continuously supported rails are generally fixed in slots in the concrete slab and called Embedded Rail Track. The rails which can be either traditional Vignole Rails with a head, web and foot, OR block rails with no web are either cast into the slots by an elastic compound or surrounded by an intimately filling boot before being fixed in place with grout. Both the surface mounted rail and the embedded block rail can be simply removed and replaced.
Ballastless tracks therefore offer a high consistency in track geometry, the adjusting of which is both less likely and less easy after the concreting of the superstructure. Therefore, ballastless tracks must be concreted within a target tolerance of +/- 1.0 mm. [1]
The elasticity of the ballast in the traditional railway superstructure is replaced by flexibility between either the discretely supported rails and the concrete ties/sleepers and/or the ties/sleepers and the concrete or asphalt slab ( e.g. sleeper boots). Often called dual resilient systems. Continuous rail supported embedded systems need only single resilience as the sides of the rail are well supported. The concrete or asphalt slab is relatively inelastic. [1]
The advantages of a ballastless track over a traditional superstructure are its highly consistent track geometry, its longer life span, and the reduced need for maintenance. [2]
A ballastless track's track geometry is achieved mainly due to its relative inelasticity in comparison to a traditional superstructure. This results in far fewer deformations and generally smoother running; train drivers (engineers) of the London Overground's East London Line have informally declared the Low Vibration Track system as the smoothest superstructure they have experienced. [3] Measurements conducted in Switzerland in 2003 and 2004 showed a standard deviation of the gauge of less than 1.2 millimetres (0.047 in). [2] This in turn increases the track's life span and reduces the need for maintenance. The usual preventive maintenance is limited to rail grinding and, in the case of surface mounted rail, inspection of the rail fixings, since tamping is not necessary due to the absence of ballast. Curative maintenance beyond rail and fixing replacement is required only after several decades. The Swiss Federal Railways replaced the ties/sleepers and rubber shoes of the ballastless track in the 4.9-kilometre (3.0 mi)-long Heitersberg Tunnel between 2014 and 2016, whereas no maintenance of the concrete slab was necessary 39 years after the tunnel's opening. [4] [5]
Due to its good experiences with the system, the Swiss Federal Railways are looking to install ballastless track wherever there is a rigid substructure—in tunnels as well as on viadaducts. [5] Elsewhere ballastless track is used in the open.
Further advantages of ballastless tracks include better and controlled drainage, the elimination of flying-ballast damage on rolling stock and civil engineering structures, a shallower superstructure, and the possibility of run-over sections such as crossings over which pneumatic vehicles can be driven. When used in stations, ballastless tracks are easier to clean. [5]
Embedded track has the potential for increased safety through simple derailment protection and support of broken rails. They alone can also be installed bythe efficient placing of the slab using the slipform process. All these benefits lead to increased track access for the traffic.
The primary disadvantage of a ballastless track is its sometimes significantly higher cost of initial construction. While numbers vary depending on construction type and track infrastructure (ballastless tracks are generally more suitable to infrastructures that are also made of concrete, as is the case in tunnels or on viaducts), the Deutsche Bahn estimated in 2015 that construction costs of ballastless tracks are in many cases 28 percent higher than those of traditional superstructure. [6] ] However, the life-cycle cost of ballastless tracks are generally lower than those of ballasted tracks due to significantly lower maintenance. [7]
Further disadvantages of ballastless tracks are the difficulty of adjusting or correcting track geometry once concrete has been set, the necessity of a stable infrastructure (since adjustments to the superstructure can be onerous), generally higher noise emissions, and longer repair times when the concrete slab is damaged (for e.g., due to construction faults, wear and tear, or accidents). Inflexibility of the track and the need to be careful with transitions between ballasted and ballastless tracks have been cited as well. [8]
Early slab track projects a range of construction types, sub-bases and fastening technologies. [9] The following list contains construction types of ballastless tracks that have been internationally used in heavy-rail systems (as opposed to light railways, tramways, or metros) in chronological order of their first usage. [8] [10]
The Bözberg/STEDEF system consists of twin ties/sleepers that are connected by a steel track rod and enclosed in a rubber shoe. All of its components can be exchanged individually. Bözberg/STEDEF was first used by the Swiss Federal Railways in the Bözberg tunnel in 1966. [5] STEDEF was further developed by SATEBA prior to the system's installation on the French LGV Méditeranée. [11]
The Rheda system consists of three layers: a base course and two slabs that are joined by rebars, as are the individual ties/sleepers. Rheda was first used by the Deutsche Bahn in Rheda-Wiedenbrück station, after which it is named, in 1972. It has since been installed on the Dutch HSL-Zuid route between Amsterdam and Rotterdam, in the Spanish Guadarrama and Sant Joan Despí tunnels, and on various Chinese high-speed lines including Wuhan–Guangzhou High-Speed Railway. [12]
The Bögl ballastless track is characterised by its use of prefabricated concrete slabs in lieu of a continuous structure that is cast on site. Mortar is used to connect the 9-ton slabs to the infrastructure and to one another. The Bögl system was developed in Germany and first tested in Dachau in 1977. The first serial installation took place in Schleswig-Holstein and Heidelberg in 1999. For its use on the high-speed link between Beijing and Shanghai, 406,000 slabs were installed. [13]
The ÖBB/PORR ballastless track (FF stands for German Feste Fahrbahn, meaning ballastless or, literally, fixed track) consists of an elastically supported track slab. It was first tested in 1989, became the standard system in Austria in 1995, [14] and has been used for over 700 kilometres of track worldwide, including the German Verkehrsprojekt Deutsche Einheit Nr. 8 (German Unity Transport Project 8) and the Doha metro. The system will be used on the first phases of the United Kingdom's High Speed 2 line, except in tunnels and for some specialist structures. [15] It is also being used for the Delhi-Meerut RRTS, the first of 3 RRTS systems currently being implemented in Delhi-NCR by NCRTC. [16]
The Low Vibration Track (LVT) system is similar to Bözberg/STEDEF in that it also uses twin ties/sleepers enclosed in rubber shoes. [5] [17] However, LVT does not feature a tie rod. [5] The system was developed and tested by Roger Sonneville together with the Swiss Federal Railways in the 1990s [1] before the rights were sold to Vigier Rail in 2009. [18] LVT has been in service in the Channel tunnel since 1994. Due to the tunnel's German name Eurotunnel, LVT is sometimes referred to as Euroblock. LVT has been used for over 1300 kilometres of track worldwide, including the Swiss Lötschberg, Gotthard and Ceneri base tunnels, the South Korean high-speed Suin Line between Songdo and Incheon, the Turkish Marmaray project, and the London Overground's East London line, as well as on viaducts in urban areas. [19] [20] LVT has become the standard ballastless-track system in Switzerland. [21]
Embedded Rail Track (ERT)
The Embedded Rail Track system uses a removable block rail and boot pad that requires no fixings but meets all the performance requirements of heavy freight (40T axles), high speed, light rail and mainline traffic loads. The system has been approved for use in Germany and the UK and tested on the Spanish high speed and heavy freight test track at Medina del Campo in Spain. Installed in 2003 as part of the UK West Coast main line at Crewe - Kidsgrove it has had zero maintenance since then while still retaining its as built track alignment. The slab can uniquely be installed as pre-cast, insitu or slipformed concrete. It provides close derailment protection and allows traffic to pass over a broken rail, Due to the additional available head wear it has twice the rail life and with only three components per track metre delivers excellent track availability at an installed cost approaching that of ballasted track. Unlike other slab tracks with surface mounted rails the concreting,alignment and railing installation activities have been decoupled to eliminate the programme and installation risks.
The IVES system (Intelligent, Versatile, Efficient and Solid) is a product of Rhomberg Rail. The system consists of a base layer (preferably common asphalt concrete) and concrete lateral structural elements, in which the rail fastening elements of the type DFF 304 [22] are directly embedded – no ties/sleepers are needed. The necessary elasticity is given only by a flexible intermediate plate in the rail fastening elements.
The structural elements of this system are individually manufactured and can be positioned laterally or longitudinally onto the base layer. The structural elements have recesses in the top, where the rail fastening elements are placed into. Afterwards, the rails are lifted onto the fastening elements and a track grid is established. The grid's exact position can now be adjusted vertically and laterally. At last, the rail fastening elements are friction-locked to the structural elements with high-strength grouting mortar. Thanks to its versatile construction and easy installation, IVES is suitable for all rail types. [23]
After testing, the first IVES track has been installed in the Asfordby Tunnel of the Old Dalby Test Track in England in 2013 [24] and since then, seven more IVES tracks have been built. The longest IVES track runs through the Bruggwaldtunnel in Switzerland, with a total length of 1,731 m (5,679 ft). [25]
Baulk track and slab track are similar in that the rails are continuously supported, compared to ordinary track where the rails have to "bridge" the gaps between the sleepers.[ citation needed ]
A railway track or railroad track, also known as a train track or permanent way, is the structure on a railway or railroad consisting of the rails, fasteners, railroad ties and ballast, plus the underlying subgrade. It enables trains to move by providing a dependable surface for their wheels to roll upon. Early tracks were constructed with wooden or cast iron rails, and wooden or stone sleepers; since the 1870s, rails have almost universally been made from steel.
The railway track or permanent way is the elements of railway lines: generally the pairs of rails typically laid on the sleepers or ties embedded in ballast, intended to carry the ordinary trains of a railway. It is described as a permanent way because, in the earlier days of railway construction, contractors often laid a temporary track to transport spoil and materials about the site; when this work was substantially completed, the temporary track was taken up and the permanent way installed.
A railroad tie, crosstie, railway tie or railway sleeper is a rectangular support for the rails in railroad tracks. Usually laid perpendicular to the rails, ties transfer loads to the track ballast and subgrade, hold the rails upright and keep them spaced to the correct gauge.
Maintenance of way refers to the maintenance, construction, and improvement of rail infrastructure, including tracks, ballast, grade, and lineside infrastructure such as signals and signs.
Track ballast is the material which forms the trackbed upon which railroad ties are laid. It is packed between, below, and around the ties. It is used to bear the compression load of the railroad ties, rails, and rolling stock; to facilitate drainage; and keep down vegetation that can compromise the integrity of the combined track structure. Ballast also physically holds the track in place as the trains roll over it. Not all types of railway tracks use ballast.
High-speed railway track construction is the process by which Lignes à Grandes Vitesses, the land on which TGV trains are to run, is prepared for their use, involving carving the track bed and laying the track. This construction technique is used both for the French TGV network and other TGV-based networks outside of France.
Pandrol is a global rail technology company, founded in 1953 and operating in over 100 countries worldwide, with over 400 railway systems having adopted its products.
Tramway track is used on tramways or light rail operations. As with standard rail tracks, tram tracks have two parallel steel rails, the distance between the heads of the rails being the track gauge. When there is no need for pedestrians or road vehicles to traverse the track, conventional flat-bottom rail is used. However, when such traffic exists, such as in urban streets, grooved rails are used.
A tamping machine or ballast tamper, informally simply a tamper, is a self-propelled, rail-mounted machine used to pack the track ballast under railway tracks to make the tracks and roadbed more durable and level. Prior to the introduction of mechanical tampers, this task was done by manual labour with the help of beaters. As well as being faster, more accurate, more efficient and less labour-intensive, tamping machines are essential for the use of concrete sleepers since they are too heavy to be lifted by hand.
A work train is one or more rail cars intended for internal non-revenue use by the railroad's operator. Work trains serve functions such as track maintenance, maintenance of way, revenue collection, system cleanup and waste removal, heavy duty hauling, and crew member transport.
A concrete sleeper or concrete tie is a type of railway sleeper or railroad tie made out of steel reinforced concrete.
A deck is the surface of a bridge. A structural element of its superstructure, it may be constructed of concrete, steel, open grating, or wood. Sometimes the deck is covered by a railroad bed and track, asphalt concrete, or other form of pavement for ease of vehicle crossing. A concrete deck may be an integral part of the bridge structure or it may be supported with I-beams or steel girders.
A rail fastening system is a means of fixing rails to railroad ties or sleepers. The terms rail anchors, tie plates, chairs and track fasteners are used to refer to parts or all of a rail fastening system. The components of a rail fastening system may also be known collectively as other track material, or OTM for short. Various types of fastening have been used over the years.
Baulk road is the name given to a type of railway track or 'rail road' that is formed using rails carried on continuous timber bearings, as opposed to the more familiar 'cross-sleeper' track that uses closely spaced sleepers or ties to give intermittent support to stronger rails.
The Research Designs & Standards Organisation (RDSO) is the research and development and railway technical specification development organisation under the Ministry of Railways of the Government of India, which functions as a technical adviser and consultant to the Railway Board, the Zonal Railways, the Railway Production Units, RITES, RailTel and Ircon International in respect of design and standardization of railway equipment and problems related to railway construction, operations and maintenance.
Ladder track is a type of railway track in which the track is laid on longitudinal supports with transverse connectors holding the two rails at the correct gauge distance. Modern ladder track can be considered a development of baulk road, which supported rails on longitudinal wooden sleepers. Synonyms include longitudinal beam track.
A track renewal train is a work train that consists of many units of machinery and materials required for track renewal projects.
The Bözberg Rail Tunnel is a railway tunnel in the Swiss canton of Aargau. It takes the Bözberg railway line of the Swiss Federal Railways under the Bözberg Pass between Effingen and Schinznach-Dorf. The original tunnel was opened during 1875; it is set to be closed to rail traffic during 2020-2021 following the commissioning of its replacement, after which it shall be converted and retained for service and rescue purposes in respect to its successor.
The Glenbrook Tunnel is a double-track railway tunnel located on the Main Western Line, near Glenbrook, in the City of Blue Mountains local government area of New South Wales, Australia. The property is owned by the Transport Asset Holding Entity. The railway tunnel is part of the Glenbrook 1913 double-track deviation, which replaced the Glenbrook 1892 single-track deviation across the Blue Mountains. The tunnel is 283 metres (928 ft) long and was officially opened on 11 May 1913.
Green track is a type of railway track in which the track bed and surrounding area are planted with grass turf or other vegetation as ground cover. It is a popular way of making railways more visually appealing, particularly for trams and light rail, and providing additional urban green space. Aside from the visual improvement, the vegetation provides a number of positive effects, such as noise reduction, less air pollution, rainwater runoff mitigation, and reduced urban heat island effect.
From Japanese experience, it has been learnt that although initial construction cost of slab track is about 1.3 times higher compared to conventional ballasted track, if we consider life cycle cost in the long run, slab track seems to win the race.
NCRTC has selected "Austrian Slab Track System" for track on main line.
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