Bangkok to Pattani, Thailand

Journey date 29 May 2022. Bangkok to SungaiKlok. Travel time about 20 hours. Royal Thailand has different types of Train system having different fare but travel time not much different.
1. Ordinary Train (ORD)
2. Rapid Train (RAP)
3. Express Train (EXP)
4. Special Express Train (SP EXP).
Seat classes
1. First Class (AC Sleeper)(Only in Express & Sp Express train)
2. Secind class (NON AC) (Sleeper or Seat)