Mass rapid transit system expansion
Mass Rapid Transit Authority of Thailand (MRTA) is expanding Bangkok’s Green Line in two directions. The existing Green Line, also known as the Sukhumvit Line, is an elevated rail line from Mo Chit in the Chatuchak District to Bearing in Bang Na District of Bangkok.
In the southern expansion, the Green Line will be extended from Bearing to Samutprakarn. The northern expansion will include the extension of the line from Mo Chit to Khu Khot, via Saphan Mai.
The Bearing-Samutprakarn section of the MRT Green Line project is in advanced stage of development. Its construction is expected to start in 2014. The extended line is scheduled to open for service in 2017.
The existing Green Line is one of the two lines of the Bangkok Skytrain transit system operated by Bangkok Mass Transit System Public Company (BTSC). The two Bangkok Skytrain lines, namely Sukhumvit Line and Silom Line, interchange at the Siam Station. The 22.25km Sukhumvit line, also known as the Green Line, extends from Siam Station in a northward direction to Mo Chit and in an eastward direction to Bearing.
The Green Line originally consisted of 17 stations from Mo Chit to On Nut when it was first opened in 1999. The rapid transit line was extended by 5.25km from On Nut (E9) to Bearing in August 2011. Five new stations were built as part of the extension. The extension, funded by the Bangkok Metropolitan Administration (BMA), was contracted to BTSC for operation.
The Thai Cabinet approved the development of mass rapid transit systems in Bangkok in November 2006, which also included the extension of the existing Green Line. Feasibility study for the Bearing-Samutprakarn section of the Green Line extension was completed by December 2007.
The Purple Line is a 23km long mass rapid heavy rail system that will connect Tao Bang Yai in the north-western suburbs of Bangkok in Nonthaburi province with Tao Poon in Bang Sue.
In November 2008, MRTA was authorised by the cabinet to operate the Bearing-Samutprakarn, as well as the Mo Chit-Saphan Mai section of the Green Line extension. Approval for extending the Green Line further from Saphan Mai to Khu Khot was received in February 2010.
The 12.6km elevated line from Bearing to Samutprakarn will involve the construction of nine new stations along the route. The stations are designed to stand along the median of Sukhumvit road with few of them integrated with other mass transit lines.
A 48-acre depot capable of housing 40 three-car trains will be built at the ending point of the route near Bang Pu. The Operation Control Centre (OCC) and administration buildings for the project will also be located in the depot area.
The Bearing- Samutprakarn extension line is expected to serve up to 57,000 passengers a day when it is complete in 2017. Preliminary construction works of the project started in 2012. The estimated cost of the project is THB 24.54bn ($763.5m).
A total of 16 stations have been identified for the Mo Chit-Khu Khot section of the MRT Green Line extension. The depot housing 36 trains and the OCC will be located near Khu Khot station.
The Mo Chit-Khu Khot Green Line MRT project was estimated to cost THB 52.97bn ($1.6bn) in 2012. It is expected to be completed in 2018 or 2019.
Both sections of the Green Line extension will be operated with 750V DC rolling stock with three to six cars.
Ch. Karnchang Public Company of Thailand was awarded a contract worth $74.6m in April 2013 for track laying and electrical systems for the Bearing-Samutprakarn section of the Green Line extension.
Alstom was awarded a €14m ($18.4m) contract by Ch. Karnchang in September 2013 towards design-build of track work and the third rail power collector for the new extension.
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