Train 52 from Chiang Mai to Bangkok Bang Sue Grand Station is an overnight Express sleeper service that offers
both air-conditioned and fan cooled sleeper berths, as well as
a good choice of cheaper seats.
Tickets for train 52 cost:
3rd Class fan cooled seat:
2nd class fan cooled day and night sleeper berth:
2nd class Air-conditioned
day and night
Train 52 offers the cheapest sleeping berths out of all the night trains that travel from Chiang Mai to Bangkok, as well a cheap seats in a fan cooled carriage for those who want to travel as cheap as possible.
You will also find restaurant car on this service where you can buy food and soft drinks (no alcohol is sold on Thai trains).
Unless you plan to travel by 3rd class seat, it is advisable to buy your tickets as far in advance as you possible can as this route down to Bangkok is very popular and can be fully booked well in advance during busy times of the year.
Tickets are available to purchase from the advance ticket counter at Chiang Mai railway station (or any other mainline SRT train station in Thailand).
If you are not in Thailand or just want an easier option: