Quadruple track

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Quadruple track section of the West Coast Main Line, England Cathiron WCML.jpg
Quadruple track section of the West Coast Main Line, England

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.

Contents

Advantages

Disadvantages

Operation

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.

Two double track lines along opposite sides of a river can operate as a quadruple track. Examples of this can be found in Rhone in France and Rhine in Germany.

Layouts

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). 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.

Examples

4-track section of Amtrak's Northeast Corridor in New Jersey COUNTY-Pre-Rebuild-West-Gantry.jpg
4-track section of Amtrak's Northeast Corridor in New Jersey

Europe

Belgium

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.

Denmark

  • There are two places in Denmark with four tracks: Between Klampenborg and Høje Taastrup, through Copenhagen, Denmark, there are four tracks; two are for the separated S-trains and two for mainline trains; where the two tracks closest to Copenhagen (the oldest and central parts of Copenhagen) are reserved for S-trains (on much the lines this is the Northern and Western two tracks). Also between Høje Taastrup and Roskilde, where the two center tracks are for InterCity, long distance commuter trains (further than Roskilde or Ringsted), while the outer two tracks are for commuter trains to/from Ringsted or Holbæk. It has been suggested that the S-trains should continue from Høje Taastrup to Roskilde, but this plan was abandoned; partly due to Roskilde refusing the offer for fear they would become a suburb of Copenhagen, and partly due to construction costs which would exceed the advantages.

Finland

Germany

  • The Berlin Stadtbahn, Germany, has four tracks. Two are for the separated S-Bahn and two for mainline trains.
  • The 112 km long Hamm–Minden railway between Hamm and Minden in Germany is completely quadruple-track with separate tracks for freight and passenger trains.
  • The 50 km long railway from Rastatt to Offenburg in Germany has four tracks.
  • The Hohenzollern Bridge, with six tracks
  • The line from Munich to Augsburg has four tracks and near Munich even more

Ireland

Quadrupled section of the Dublin Suburban Rail system Kishoge Station.jpg
Quadrupled section of the Dublin Suburban Rail system

Italy

  • The Rome–Naples high-speed railway and the Rome–Sulmona–Pescara railway in Italy combine to form a quadruple track section between Roma Prenestina railway station and Salone railway station.
  • The main section of Ferrovie Nord Milano line between Milan and Saronno in Italy. Outer regional trains are segregated from the inner suburban trains.

Netherlands

Portugal

Sweden

Switzerland

United Kingdom

Quadruple track section of the Midland Main Line, England St Albans MMB 02 Midland Main Line 319433.jpg
Quadruple track section of the Midland Main Line, England

The Americas

United States

East coast
Midwest
West coast

Asia

China

Huning Lines Huning Lines.jpg
Huning Lines

Hong Kong

India

Indonesia

Israel

  • The Coastal Railway between Tel Aviv Central and Herzliya. In 2020 construction started on an NIS 5.5 billion (US$1.5 billion in 2018 dollars) project to extend the 4 track section along about 10km south from Tel Aviv Central to Tel Aviv HaHagana and from there to the Ganot/Shapirim interchange on the Tel Aviv–Lod Railway. In the future, four tracking of the Coastal Railway is also planned to extend north of Herzliya to Haifa in stages.

Japan

Four track stretch of the Keihan Main Line in Japan Keihan Electric Railway 012.JPG
Four track stretch of the Keihan Main Line in Japan
  • Hankyu Railway in Osaka has a sextuplicated section between Umeda and Juso stations (2.4 km). [5]
  • Keihan Main Line in Osaka is quadruplicated between Temmabashi and Neyagawa Signal Box (~13 km). [6]
  • Odakyu Odawara Line in Tokyo is quadruplicated between Mukogaoka-Yuen and Yoyogi-Hachiman Stations.
  • Tokyu Toyoko and Meguro Lines in Tokyo run parallel beside each other between Hiyoshi and Tamagawa Stations.
  • Seibu Ikebukuro Line in Tokyo is quadruplicated between Shakujii-koen and Sakuradai Stations.
  • Tobu Tojo Line in Tokyo is quadruplicated between Wakoshi and Shiki Stations.
  • Tobu Skytree Line in Tokyo is quadruplicated between Kita-Koshigaya and Kita-Senju Stations.
  • Between Tokyo and Odawara (JR East) 83.9 km is paired by use (not including Shinkansen). [7]
    • Tokyo – Shinagawa 6.8 km: 6 tracks (8 if include Sobu-Yokosuka Line Underground)
    • Shinagawa – Tsurumi 14.9 km: 4 tracks
    • Tsurumi – Yokohama 7.1 km: 6 tracks
    • Yokohama – Totsuka 12.1 km: 4 tracks
    • Totsuka – Ofuna 5.6 km: 6 tracks
    • Ofuna – Odawara 37.4 km: 4 tracks
  • Between Tokyo and Omiya (JR East) is paired by use (not including Shinkansen) [8]
    • Tokyo – Akihabara: 6 tracks
    • Akihabara – Ueno: 6 tracks
      • (Tokyo – Ueno 3.6 km)
    • Ueno – Nippori 2.2 km: 10 tracks (2 for Ueno Depot)
    • Nippori – Tabata: 4 tracks
    • Nippori – Oku: 4 tracks
    • Tabata – Akabane: 4 tracks
    • Oku – Akabane: 2 tracks
      • (Nippori – Akabane 7.4 km)
    • Akabane – Omiya 17.1 km: 6 tracks
  • Between Kusatsu and Nishi-Akashi (JR West) 120.9 km (not including Shinkansen) [9]
    • Kusatsu – Kyoto 22.2 km is paired by direction: 4 tracks
    • Kyoto – Umekoji – Mukomachi 6.4 km is paired by direction: 5 tracks
    • Mukomachi – Ibaraki 21.8 km is paired by direction: 4 tracks
    • Ibaraki – Suita is paired by use: 6 tracks
    • Suita – Shin-Osaka is paired by use: 8 tracks
    • Shin-Osaka – Osaka – Tsukamoto is paired by direction: 4 tracks
      • (Ibaraki – Osaka 14.6 km)
    • Shin-Osaka – Miyahara – Tsukamoto: 2 tracks
    • Tsukamoto – Hyogo is paired by direction: 4 tracks
    • Hyogo – Takatori is paired by direction: 5 tracks
      • (Osaka – Takatori 38.2 km)
    • Takatori – Nishi-Akashi 17.7 km is paired by use: 4 tracks
  • Between Ochanomizu and Mitaka (JR East) 21.5 km is paired by use. [10]
    • Ochanomizu – Yoyogi: 4 tracks
    • Yoyogi – Shinjuku: 8 tracks
    • Shinjuku – Mitaka: 4 tracks
  • Between Kinshicho and Chiba (JR East) 34.4 km is paired by use. [11]
    • Kinshicho – Nishi-Chiba: 4 tracks
    • Nishi-Chiba – Chiba: 6 tracks
  • Between Ayase and Toride (JR East) 29.7 km: 4 tracks/paired by use [12]
  • Between Osaki and Komagome (JR East) about 20 km is paired by use. [13]
    • Osaki – Yoyogi: 4 tracks
    • Yoyogi – Shinjuku: 8 tracks
    • Shinjuku – Komagome: 4 tracks
  • Between Souen and Heiwa (JR Hokkaido) about 9 km [14]
    • Souen – Sapporo is paired by use: 3 tracks
    • Sapporo – Heiwa is paired by direction: 4 tracks
  • Between Niigata and Kami-Nuttari (JR East) 1.9 km: 4 tracks/paired by direction [15]
  • Between Imamiya and Tennoji (JR West) 2.2 km: 4 tracks/paired by direction [15]
  • Between Inazawa and Nagoya (JR Central) 11.1 km/paired by use: 4 tracks [16]
  • Between Hiroshima and Kaitaichi (JR West) 6.4 km: 4 tracks/paired by direction [17]
  • Between Orio and Moji (JR Kyushu) 24.6 km [18]
    • Orio – Kokura: 4 tracks/paired by use
    • Kokura – Higashi-Kokura 1.6 km/paired by direction: 6 tracks
    • Higashi-Kokura – Moji is paired by direction: 4 tracks
  • Besides JR companies, the following private railway companies in Japan run their own quadruple (or more) tracked sections:

South Korea

Thailand

Turkey

Oceania

Australia

Turrella station on the East Hills line Turella railway station city end.jpg
Turrella station on the East Hills line

See also

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References

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  11. Japan Railfan Magazine (Koyusha) No. 478 p. 22
  12. Japan Railfan Magazine (Koyusha) No. 478 p. 23
  13. Japan Railfan Magazine (Koyusha) No. 478 p. 24
  14. Japan Railfan Magazine (Koyusha) No. 478 p. 25
  15. 1 2 Japan Railfan Magazine (Koyusha) No. 478 p. 26
  16. Japan Railfan Magazine (Koyusha) No. 478 p. 27
  17. Japan Railfan Magazine (Koyusha) No. 478 p. 28
  18. Japan Railfan Magazine (Koyusha) No. 478 p. 29