Does the bright yellow Mukdahan-Rayong service not pass thro Sisaket
Have to say no.
http://www.iloveyellowbus.com/en/home.php
The East: Rayong, Pattaya, Bowin, Sriracha, Chonburi, Sakaew, and Aranyaprathet
The North East: Norndindaeng, Nangrong, Prakonchai, Prasart, Surin, Burriram, Satuk, Payakkaphumpisai, Wapeepathum, Tatoom, Suwannapoom, Roiet, Ponethong, Yasothon, Patew, Umnatcharoen, Sanangkanikhom, Kushinarai, Loengnoktar, Nikomkumsoi, Kumchaee, and Mukdahan
The South: Samutsakhon, Samutsongkram, Petchburi, Cha Um, Hua Hin, Chumporn, Lungsuan, Surattani, Kanjanadith, Donsak, Koh Samui, Phangha, and Phuket