This article needs additional citations for verification .(January 2013) |
A quadruple-track railway (also known as a four-track railway) is a railway line consisting of four parallel tracks with two tracks used in each direction. Quadruple-track railways can handle large amounts of traffic, and so are used on very busy routes or sections. Such conversion is referred to as "quadruplication".
A railway line with six parallel tracks, or a sextuple-track railway, has three tracks in each direction. The corresponding term is "sextuplication".
There are also instances of railway lines or sections with eight tracks, and cases with three or five tracks. All experience similar upsides and downsides.
In quadruple track, trains are sorted in various ways in order to make maximum use of track capacity. These can include one or a combination of:
A faster express line and a stopping local line are separated, with each having a separate pair of tracks. Construction of new double tracks dedicated to high-speed rail alongside existing conventional double track used by regional and local passenger trains and freight trains is a form of quadruple track. It increases the capacity of that route significantly, and allows for significant increases in inter-city high-speed train frequency with reduced travel times.
Long-distance inter-city rail and freight trains are separated from short distance commuter rail. This helps to prevent delays on one service affecting the other, and is commonly seen in metropolitan areas. Quadrupling may be necessary when a new commuter rail service begins to operate on an existing line. Sometimes the local trains have separate technology, such as electrical system or signalling, which requires strict separation, for example in Berlin or Copenhagen.
When a quadruple-track line divides to different destinations part way along, trains need to be sorted by their destination.
Passenger trains and freight trains can be separated with each different track.
A variation of this can be found on the quadruple track section of the Main Northern line in New South Wales between Waratah and Maitland where one pair of tracks are used exclusively for coal trains and the other pair are used for passenger trains and general freight. A similar process, but with all intercity and commuter passenger trains on the outer tracks and thru-freight trains on the inner tracks, was done by the Pennsylvania Railroad on its New York–Washington and Philadelphia–Pittsburgh mainlines prior to the takeover of operations by Amtrak and Conrail (and later Norfolk Southern). This is somewhat still done to this day by NS, CSX, and Conrail Shared Assets trains on Amtrak-owned trackage in the Philadelphia area. Future passenger and freight-separated track pairs are planned by the state of Virginia on the corridor between Washington, D.C. and Richmond, Virginia, [1] and by California High-Speed Rail between Los Angeles and Fullerton, California. [2]
Two separate double-track lines in proximity to each other, e.g., two double-track lines along opposite sides of a river, can operate as a quadruple track line. Examples of this can be found in Rhone in France and Rhine in Germany.
As it can be seen from the pictures below in the Gallery of diagrams, the four tracks can be paired either by direction (slow and fast in each pair) or by purpose (speed or direction in each pair). Pairing by direction allows the railway to interface to a double track more easily. With fast trains in centre, local stations can be on the outside, eliminating staircases for half the passengers. With slow trains in centre or when pairing by speed there can be a common platform for local trains with one staircase and one ticket booth.
Sometimes two of the tracks go more straight and with a little distance from the two other. This is a design decision when widening a double track section, and allows higher speed on the faster tracks.
Several lines radiating from Brussels are quadrupled, for instance the Ghent-Ostend line as far as Essene-Lombeek. Further quadrupling has recently been carried out as part of the development of the Brussels Regional Express Network. The building of high-speed lines has also led to quadrupling - for instance the HSL 2 high-speed line between Brussels and Cologne runs inside the local lines as far as Leuven. Meanwhile since 1934 Brussels and Antwerp have been connected by two separate pairs of double track. Fast trains normally use line 25, while line 27 serves slow trains. In places they run parallel, but at times diverge and cross over each other.
There are two places in Denmark with four tracks:
By definition German railway lines have one or two tracks. Where more tracks are running parallel to each other, they are considered two or more separate lines. Such routes include:
There are some quadruple-track railways in the Oslo region. They are mostly two double tracks with slightly different routes, one older for local trains, and one newer mostly in tunnels for high-speed and regional trains.
The country never implemented a quadruple-track line throughout its history, but there are plans for sections of the North–South Commuter Railway (NSCR) to be quadruplicated.
Commuter rail, or suburban rail, is a passenger rail transport service that primarily operates within a metropolitan area, connecting commuters to a central city from adjacent suburbs or commuter towns. Commuter rail systems are considered heavy rail, using electric or diesel trains. Distance charges or zone pricing may be used.
The Yamanote Line is a loop service in Tokyo, Japan, operated by the East Japan Railway Company. It is one of Tokyo's busiest and most important lines, connecting most of Tokyo's major stations and urban centres, including Marunouchi, the Yūrakuchō/Ginza area, Shinagawa, Shibuya, Shinjuku, Ikebukuro, and Ueno, with all but two of its 30 stations connecting to other railway or underground (subway) lines.
The interurban is a type of electric railway, with tram-like electric self-propelled railcars which run within and between cities or towns. The term "interurban" is usually used in North America, with other terms used outside it. They were very prevalent in many parts of the world before the Second World War and were used primarily for passenger travel between cities and their surrounding suburban and rural communities. Interurban as a term encompassed the companies, their infrastructure, their cars that ran on the rails, and their service. In the United States, the early 1900s interurban was a valuable economic institution, when most roads between towns, many town streets were unpaved, and transportation and haulage was by horse-drawn carriages and carts.
The Iida Line is a Japanese railway line connecting Toyohashi Station in Toyohashi, Aichi with Tatsuno Station in Tatsuno, Nagano, operated by Central Japan Railway Company. The line links eastern Aichi Prefecture and southern Nagano Prefecture through northwestern Shizuoka Prefecture. It goes through steep mountains as well as cities such as Iida and Ina. The line was originally four different private railway lines, the first of which opened in 1897.
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.
The Oslo Tunnel is a 3,632-metre (2.257 mi), double-track, railway tunnel which runs between Olav Kyrres plass and Oslo Central Station (Oslo S) in Oslo, Norway. The tunnel constitutes the easternmost section of the Drammen Line and runs below the central business district of Oslo. It features the four-track Nationaltheatret Station, Norway's second-busiest railway station, where the Oslo Tunnels lies directly beneath the Common Tunnel of the Oslo Metro. At Frogner, the Elisenberg Station was built, but has never been used. The tunnel is the busiest section of railway line in Norway and serves all west-bound trains from Oslo, including many services of the Oslo Commuter Rail and the Airport Express Train.
Railroad electrification in the United States began at the turn of the 20th century and comprised many different systems in many different geographical areas, few of which were connected. Despite this situation, these systems shared a small number of common reasons for electrification.
The Belfast–Dublin Main Line is a main and the busiest railway route on the island of Ireland that connects Dublin Connolly station in the Republic of Ireland and Belfast Lanyon Place station in Northern Ireland. It is the only railway line that crosses the Republic of Ireland–United Kingdom border.
The Cologne–Aachen high-speed line is the German part of the Trans-European transport networks project high-speed line Paris–Brussels–Cologne. It is not a newly built railway line, but a project to upgrade the existing railway line which was opened in 1841 by the Rhenish Railway Company. When it was continued into Belgium in 1843, it became the world's first international railway line.
The Asker Line is a 9.5-kilometre (5.9 mi) railway line between Asker and Lysaker in Norway. The line runs along the same corridor as the Drammen Line, offering increased capacity, speed and regularity on the rail network west of Oslo. The first part opened in 2005, and in 2011 an extension opened from Sandvika to Lysaker. Original plans called for an extension to Skøyen, but from 2020, new planning is under way for an extension all the way to Oslo Central Station. Most of the railway is in tunnel and is dimensioned for 160 km/h (99 mph) running. The entire railway is electrified at 15 kV 16.7 Hz AC. The first section cost 3.7 billion kr, while the second is budgeted at NOK 2.7 billion.
Limerick Suburban Rail are a group of Iarnród Éireann commuter train services from Limerick Colbert to various other destinations on three different lines.
The TCDD E43000 is a twin-cab six-axle Bo-Bo-Bo electric locomotive used previously by the Turkish State Railways and currently by TCDD Taşımacılık in Turkey. The locomotives were designed by Toshiba and built by TÜLOMSAŞ at their Eskişehir shops. The locomotive is based on the JNR Class EF63 electric locomotive in Japan, built by Toshiba. The Turkish State Railways ordered 45 locomotives as part of the railways electrification program of the late-1980s early-1990s.
The Baden main line is a German railway line that was built between 1840 and 1863. It runs through Baden, from Mannheim via Heidelberg, Karlsruhe, Offenburg, Freiburg, Basel, Waldshut, Schaffhausen and Singen to Konstanz. The Baden Mainline is 412.7 kilometres long, making it the longest route in the Deutsche Bahn network and also the oldest in southwest Germany. The section between Mannheim and Basel is the most important northern approach to the Swiss Alpine passes, whilst the section between Basel and Konstanz is only of regional significance. The stretch from Karlsruhe to Basel is also known as the Rhine Valley Railway (Rheintalbahn) and the Basel–Konstanz section as the High Rhine Railway (Hochrheinstrecke).
Ankara railway station is the main railway station in Ankara, Turkey, and is a major transportation hub within the city. The station is on the rail corridor which connects east and west Turkey, which is high speed between Istanbul and Sivas. Ankara station is also a hub for YHT high-speed trains, with its own exclusive platforms and concourse. TCDD Taşımacılık also operates intercity train service to Kars, Tatvan and Kurtalan as well as Başkentray commuter rail service.
The Mannheim–Karlsruhe–Basel railway is a double-track electrified mainline railway in the German state of Baden-Württemberg. It runs from Mannheim via Heidelberg, Bruchsal, Karlsruhe, Rastatt, Baden-Baden, Offenburg and Freiburg to Basel, Switzerland. It is also known as the Rhine Valley Railway or the Upper Rhine Railway (Oberrheinbahn).
The Istanbul–Ankara railway is a 576.6 km (358.3 mi) long electrified railway in Turkey. The line connects Turkey's largest city, Istanbul, to the capital and second largest city, Ankara; making it one the busiest railways in the country in terms of passenger and freight rail traffic. Beginning at Haydarpaşa station in Istanbul and terminating at Ankara railway station in Ankara, the railway runs parallel to the Ankara-Istanbul high-speed railway and in several sections, hosts YHT high-speed trains.
The State Railways of the Republic of Turkey, abbreviated as TCDD, is a government-owned national railway company responsible with the ownership and maintenance of railway infrastructure in Turkey, as well as the planning and construction of new lines. TCDD was formed on 4 June 1929 as part of the nationalisation of railways in Turkey.
The Hamm–Minden Railway is an important and historically significant railway in Germany. It is completely quadruple track. It is a major axis for long distance passenger and freight trains between the Ruhr and the north and east of Germany. It is the part of the trunk line built by the Cologne-Minden Railway Company from Köln Deutz to Minden. It was opened in 1847 and has been modernized and developed several times since then.
TCDD Transport is a government-owned railway company responsible for the operations of most passenger and freight rail in Turkey. The company was formed on 14 June 2016, splitting off from the Turkish State Railways (TCDD) to take over railway operations, while TCDD would continue to administer railway infrastructure. TCDD Taşımacılık officially began operations on 1 January 2017.
The Mindanao Railway, previously known as the Trans-Mindanao High Speed Railway, is a proposed railway system in Mindanao, the southernmost major island of the Philippines. Originally proposed in 1936 as part of Manuel L. Quezon's efforts to strengthen the presence of Commonwealth government in Mindanao against the rising influence of Imperial Japan before World War II, the line was shelved. Other proposals and studies were made in the 1950s, 1990s, and the 2000s, but never materialized. The current line began development in 2018; however, construction has yet to start. It will be initially built as a single-track standard gauge system to be operated by diesel-powered rolling stock, but will have provisions for upgrading to double-track and electrification through overhead lines.