The 13km extension of Bangkok's Green Line electric railway was opened on Thursday, linking the capital with Samut Prakan province and commuters could use it for free for four months until mid-April.
Prime Minister Prayut Chan-o-cha opened the link in a ceremony at the extended route's train depot in Muang district of Samut Prakan in the morning.
He said the new link would help relieve traffic congestion and serve people of Samut Prakan who worked in Bangkok. After the opening ceremony, he tried the service from the depot to an adjacent station.
There are nine stations along the Bearing-Samut Prakan extended route plus a park-and-ride compound covering 18 rai for 1,200 vehicles at the Kheha Samut Prakan station.
The construction of the extended and elevated link started in 2012 and the Green Line service was extended from Bearing for one station to the Samrong station in April last year.
Free service from Samrong to the Kheha Samut Prakan will continue until April 15 next year.