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The present Bangkok mass transit system comprises two different types of metros: 1) the elevated BTS system, the so-called Skytrain - rot fai fah in Thai, and 2) the underground MRT subway. Although BTS and MRT use similar technology (trains, signalling & train control), there is no track connection between them. All MRT stations are equipped with platform-screen-doors, which initially did not apply to any BTS station (in the meantime, the busiest have been retrofitted with half-height gates).

Besides the mass transit rail systems, Water Buses provide a fast transport service on the Chao Phraya River; at present, transfer to the BTS system is only possible at Saphan Taksin station.

This is a completely elevated system built by Siemens as a turnkey project, opened in 1999, initially 23 km long with 23 stations. The BTS system consists of two lines:
the Sukhumvit Line (33 km) and
the Silom Line (11.5 km).

Track gauge is 1435 mm and power supply is via third rail at 750 V DC. The original 3-car trains were 65 m long (a fourth car was added to all trains between 2012 and 2013), air-conditioned and run at an average speed of 35 kph. Saphan Taksin station on the Silom Line was only planned as a temporary station, but as it offers an excellent connection to the Water Buses on Chao Phraya River, it remains open after the extension to Wongwian Yai, although the single-track section at Saphan Taksin station limits the capacity on the Silom Line. The elevated Green Line depot is connected to Mo Chit station.

05 Dec 1999: basic BTS network
- Sukhumvit Line Mo Chit - On Nut
- Silom Line National Stadium - Saphan Taksin

15 May 2009: Silom Line Saphan Taksin - Wong Wian Yai (2.2 km)
12 Aug 2011: Sukhumvit Line On Nut - Bearing (5.25 km)
12 Jan 2013: Silom Line Wong Wian Yai - Pho Nimit (1.0 km)
14 Feb 2013: Silom Line Pho Nimit - Talat Phlu (1.2 km)
05 Dec 2013: Silom Line Talat Phlu - Bang Wa (2.6 km)
03 Apr 2017: Sukhumvit Line Bearing - Samrong (1.2 km)
06 Dec 2018: Sukhumvit Line Samrong - Kheha (10 km; operated separately from the Mo Chit - Samrong main line)

Photos © Neil Madhvani | Craig Moore | Roman Meister

 MRT Blue Line (BEM)

In August 1997 construction work began on this 21 km underground full metro with 18 stations; it finally opened for trial service in April 2004. In December 2001, Siemens was awarded the contract to build 19 three-car trains for this line and to provide the necessary operating equipment. This is an MRT line (MRTA) but BEM (formerly BMCL) is the operator via a concession contract from the MRTA.

A 1-station extension from Bang Sue to Tao Poon was eventually completed in Aug 2017 to create an interchange with the Purple Line.

The standard Blue Line station has an island platform on level -3. Sam Yan, Silom and Lumphini stations have side platforms on different levels, each with trains to Bang Sue on level -2, and trains to Hua Lamphong on level -4, whereas Bang Sue and Khlong Toei stations have two side platforms on the same level. Thailand Cultural Centre is much bigger than other comparable stations: the Blue Line stops on level -3, while level -2 is prepared to accommodate the Orange Line in the future. The surface Blue Line depot is connected directly to both Thailand Cultural Centre and Phra Ram 9 stations. A track connection between Blue and Orange Lines will be made via this depot.

13 April 2004: trial service

03 July 2004: Bang Sue - Hua Lampong (normal revenue service)
11 Aug 2017: Bang Sue – Tao Poon (1.2 km)

 MRT Purple Line (BEM)

Elevated metro line: 16 stations, 23 km; Construction started early 2010, opened in Aug 2016. (Website)

Like the Blue Line, this is an MRT line (MRTA) operated by BEM (formerly BMCL) via a concession contract from the MRTA.

06 Aug 2016: Tao Poon - Khlong Bang Phai

Photos © Roman Meister | More Purple Line photos here

 City Line & Airport Rail Link

28 km elevated line with 8 stations, standard gauge, from Phaya Thai via Makkasan/City-Terminal to Suvarnabhumi Airport, every 15 minutes, shared with special non-stop airport express which departs from Makkasan/City-Terminal, opened for commercial operation on 23 August 2010. After some years, however, the Airport express trains were discontinued, and the red trains now also operate as all-stops City Line trains.

23 Aug 2010 - City Line & Airport Rail Link

Photos © Amnat Phutthamrong | Roman Meister

 Projects

BTS Light Green Line (Sukhumvit)
East:
1) Samut Prakan to Bang Pooyai, 7.5km, 4 stations (E24-E27). (Planned)

North:
1) Mo Chit station to Saphan Mai: 11.9 km, 11 stations (N9–N20). (Construction started in Aug 2015 for completion in late 2019) - Mo Chit - Lat Phrao Intersection (1.4 km) opening June 2019
2) Saphan Mai to Khoo Khut: 7.5 km, 4 stations (N21-N24). (Construction started in Aug 2015 for completion in late 2019)
3) Khoo Khut to Lam Lukka: 9km, 5 stations (N25-N29). (Planned)
4) Sena Ruam station (N6). (Planned to be built in 2018)

BTS Dark Green Line (Silom)
South:
1) Bang Wa to Taling Chan: 7.5km, 6 stations (S13-S18). (Planned)
2) Suksa Wittaya station (S4). (Planned to be built in 2018)

West:
1) National Stadium (W1) to Yot Se: 2 stations 2.2kms. (Planned)

MRTA :

1) Blue Line extension (construction started mid-2011, opening 2019/20) (Website):
  a) Tao Poon - Tha Phra, 11.9 km with 10 elevated stations (opening Feb 2020)
  b) Hua Lamphong - Lak Song, 13.9 km 11 stations ( 8.9 km 7 stations elevated, 5 km 4 stations underground) (opening 12 August 2019)

2) Pink monorail Line (Pak Kret - Lak Si - Min Buri): 30 stations, 36km (Construction started Dec 2017, opening 2022/3) (Website)
3) Orange Line - 37 km, 27 stations (26 km 20 stations underground, 11 km 7 stations elevated) (Website)
  a) Phase 1 east section: Thai Cultural Center - Bang Kapi - Min Buri (21km, 18 stations - 11 underground, 7 elevated). (Construction started June 2017 for completion in late 2022.)
  b) Phase 2: west section (Thai Cultural Center to Bang Khunnon): 12 Stations (Planned)

4) Yellow monorail Line (Lat Phrao – Bangkapi - Samrong): 31 km, 22 stations (Construction started Dec 2017, opening 2022/3) (Website)
5) Purple Line southern extension (Tao Pun – Wong Wian Yai – Phra Padeang): 23.6km 17 stations (12.6km 10 stations underground, 11km 7 stations elevated) (Planned) (Website)
6) Blue Line west extension (Lak Song - Phutthamonthong Sai 4): 8km, 4 stations (Planned)
7) Brown monorail Line (Nonthaburi - Lam Sali): 22km, 21 stations (Planned)

BMA (Bangkok Municipal Authority project):
1)    Grey Line (Watcharapon – Thonglor – Rama 9 bridge): 26km, 21 stations (Planned)

SRT Airport Rail Link (ARL): 
Extension from Makkasan (City Air Terminal) to new Bang Sue Terminal and Don Muang Airport (2nd BKK Airport): 5 stations, 21.8 km (18.3 km elevated, 3.5 km underground) (Planned)

SRT: Suburban Rail System (elevated, 1000 mm gauge):

1) Light Red Line: Bang Sue - Taling Chan (narrow gauge): 15km, 5 stations. Line opened for limited services (3 stations) late 2012, but operation is currently suspended. (Website) 
2) Dark Red Line: Bang Sue - Rangsit (narrow gauge): 26km, 8 stations. (Construction started mid 2013 for completion in 2020) 
3) Light Red Line west extension (Taling Chan – Salaya): 12km, 4 stations. (Planned)
4) Dark Red Line north extension: Rangsit - Thammasat University: 10kms, 4 stations. (Planned)
5) Light Red Line east extension (Bang Sue - Hua Mark): 11kms, 7 stations (Planned)
6) Dark Red Line south extension (Bang Sue - Mahachai): 59kms, 22 stations (Planned)
   a) Bang Sue to Hualumphong - Wong Wian Yai, 7 stations
   b) Wong Wian Yai - Mahachai, 15 stations

BTS Skytrain Official Page

Bangkok Metro (BEM) (Blue & Purple Lines - official website)

MRTA Mass Rapid Transit Authority of Thailand

Airport Rail Link

Bangkok Skytrain and Bangkok Metro at Wikipedia

Suvarnabhumi Airport Link at Wikipedia

2bangkok.com (News about Mass Transit)

Transit Bangkok

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