The Bangkok Airport Link is an elevated train system that connects Suwannaphum Airport (fig.) with Phaya Thai in Bangkok's city center. There is an Express Line, with a blue stripe on the front of the train, and a City Line, which has a red stripe on the front of the train.

The Express Line runs between the terminus and the airport without stops, while the City Line stops at all 8 stations, and connects with both the MRT or Bangkok Metro and the Skytrain  or BTS, i.e. the Bangkok Mass Transit System.