[1] TSB runs a fleet of EV buses, aimed at reducing carbon emissions.
[2][3] Thai Smile Bus also operates electric ferries along the Chao Phraya River and Khlong Saen Saeb in Bangkok.
[4] The company was registered on 9 June 2020 with Kulpornphat Wongmajarapinya as CEO and Chairwoman, who retains a 51% majority ownership stake.
[7] As part of Bangkok Mass Transit Authority's bus reform plan to allow private operators to take over existing BMTA routes, TSB came to inherit a fleet of a fleet of approximately 350 diesel buses.
By January 2024, however, the company decommissioned all of its NGV buses, running a fleet of 100% electric vehicles.
As of 2025, TSB operates a total of 123 bus routes throughout the Bangkok Metropolitan Region.
Notably, TSB has come to operate Route 8, a bus line notorious for a high incidence of reckless driving.