Thailand Train Timetable
The Northern Timetable from Bangkok to Chiang Mai:
The Southern Timetable from Bangkok to Hat Yai (Continuing on to Butterworth in Malaysia (just next to Penang Island and 4 hours train/bus to Kuala Lumpur).
To see another timetable, showing not just trains to Bangkok (eg: local, 3rd class trains between Hat Yai and Surat Thani/Chumphon), visit this page.
The Northeastern Timetable from Bangkok up to Nong Khai (next to the Laos Border, very close to the Laos capital, Vientiane):
The Eastern Timetable, from Bangkok to Aranyaprathet (for the border crossing into Cambodia (Poipet is the town on the Cambodian side) ):
Return from Thailand Train Timetable to Thailand Train Travel