The Grey Line is a new monorail project linking Vacharapol in northern Bangkok with Thong Lor in the Sukhumvit business area as well as Lumpini Park with the Tha Phra area in Thon Buri.

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 ... car metro trains operate on the ...