East West Line

The first segment of what will be the East West line, between City Hall to Outram Park, was opened on 12 December 1987 as part of the North South line. It was extended westwards to Clementi on 12 March 1988. During the construction of the extension to Clementi, roads have to realigned for the new MRT line over Commonwealth Avenue West. The line later extended to Lakeside on 5 November 1988. The 15-kilometre (9.3 mi) eastern extension to Tanah Merah opened on 4 November 1989, and the opening ceremony was attended by then First Deputy Prime Minister Goh Chok Tong. At this point, the East West line was formed, reflecting the operational split from the North South line which has at the same time extended to Marina Bay, and uses a green coloured theme.

The 6-kilometre (3.7 mi) line extension to Pasir Ris station was opened ahead of schedule on 16 December 1989 with a sneak preview beforehand. Boon Lay station opened on 6 July 1990. Dover however, opened on the 18th of October, 2001. It opened between Buona Vista and Clementi, making it the first infill station of Singapore.

On 11 January 2011, the Tuas West extension, an extension of the East West line from Joo Koon to Tuas Link was announced. The extension has a span of 7.5 kilometres (4.7 mi), which spans a twin-tracked MRT viaduct, four above-ground stations and a 26-hectare depot to provide stabling and maintenance facilities for the additional trains that will be bought for the extension and to cater for future expansion of the line. The viaduct is integrated with part of a 4.8-kilometre-long (3.0 mi) road viaduct along Pioneer Road, which will increase the road capacity to cope with anticipated increase in traffic. The stations are Gul Circle, Tuas Crescent, Tuas West Road, and Tuas Link. On 4 May 2012, the Land Transport Authority marked the start of construction of the Tuas West extension with a groundbreaking ceremony at the site of the future Tuas Link.

The extension began service on 18 June 2017. During initial stages after opening, the westbound trains will alternate their terminus between Joo Koon and Tuas Link, where for every two trains, one train will terminate at the former, while the other train will terminate at the latter.

			Station Name	Chinese Name	Tamil Name	Code	Other code
			Changi Airport	樟宜机场	சாங்கி விமானநிலையம்	CG2
			Expo	博览	எக்ஸ்போ	CG1	DT35
			Pasir Ris	巴西立	பாசிர் ரிஸ்	EW1
			Tampines	淡滨尼	தெம்பினிஸ்	EW2	DT32
			Simei	四美	ஸீமெய்	EW3
			Tanah Merah	丹那美拉	தானா மேரா	EW4	CG
			Bedok	勿洛	பிடோக்	EW5
			Kembangan	景万岸	கெம்பாங்கான்	EW6
			Eunos	友诺士	யூனுஸ்	EW7
			Paya Lebar	巴耶利峇	பாய லேபார்	EW8	CC9
			Aljunied	阿裕尼	அல்ஜூனிட்	EW9
			Kallang	加冷	காலாங்	EW10
			Lavender	劳明达	லவண்டர்	EW11
			Bugis	武吉士	பூகிஸ்	EW12	DT14
			City Hall	政府大厦	நகர மண்டபம	EW13	NS25
			Raffles Place	莱佛士坊	ராஃபிள்ஸ் பிளேஸ்	EW14	NS26
			Tanjong Pagar	丹戎巴葛	தஞ்சோங் பகார்	EW15
			Outram Park	欧南园	ஊட்ரம் பார்க்	EW16	NE3TE17
			Tiong Bahru	中峇鲁	தியோங் பாரு	EW17
			Redhill	红山	ரெட்ஹில்	EW18
			Queenstown	女皇镇	குவீன்ஸ்டவுன்	EW19
			Commonwealth	联邦	காமன்வெல்த்	EW20
			Buona Vista	波那维斯达	புவன விஸ்தா	EW21	CC22
			Dover	杜弗	டோவெர்	EW22
			Clementi	金文泰	கிளிமெண்டி	EW23
			Jurong East	裕廊东	ஜூரோங் கிழக்கு	EW24	NS1
			Chinese Garden	裕华园	சீனத் தோட்டம்	EW25
			Lakeside	湖畔	ஏரிக்கரை	EW26
			Boon Lay	文礼	பூன் லே	EW27
			Pioneer	先驱	பயனியர்	EW28
			Joo Koon	裕群	ஜூ கூன்	EW29
			Gul Circle	卡尔圈	குல் வட்டம்	EW30
			Tuas Crescent	大士弯	துஆஸ் கிரசன்ட்	EW31
			Tuas West Road	大士西路	துஆஸ் மேற்கு	EW32
			Tuas Link	大士连路	துஆஸ் இணைப்பு	EW33