The MRT Blue Line (Thai: รถไฟฟ้ามหานคร สายสีน้ำเงิน) or MRT Chaloem Ratchamongkon Line (Thai: รถไฟฟ้ามหานคร สายเฉลิมรัชมงคล) is Bangkok's third rapid transit line, following Sukhumvit Line and Silom Line of the BTS Skytrain. It is the first line of the MRT system and is operated by Bangkok Expressway and Metro (BEM). The line has a total length of 48 km (29.83 mi), operating as a semi-circle or spiral route from Lak Song to Tha Phra which also serves as a self-interchange station.
The first stage of the MRT Blue Line, a 20 km (12.43 mi) semi-circle alignment from Hua Lamphong to Bang Sue opened on 3 July 2004, which was then followed by a 1.2 km (0.75 mi) extension to Tao Poon opened on 11 August 2017. The line was extended to the west from Hua Lamphong through new stations in the Chinatown and Rattanakosin Island on 29 September 2019. Finally, the line was extended south from Tao Poon to Tha Phra through new stations in Thonburi on 30 March 2020, completing the semi-circle line. Another 7.8 km (4.8 mi), 4 station extension from Lak Song to Phutthamonthon Sai 4 is planned but remains unbuilt.
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