There are 10 daily Surat Thani to Bangkok train services to Hualamphong railway station with the duration of the trip taking between 9 to 12 hours to travel the 651 km distance and tickets costing between 217 THB for a 3rd Class seat to over 1500 for a 1st Class sleeper berth.
If you want to take the train from Surat Thani to Bangkok you first have to get to the Surat Thani Railway station which is actually located in Phun Phin, around 15 kilometres away from the city centre.
As most people using the station will be coming off one of the many ferries from Koh Samui, this is not a problem as there are many buses that operate from the ferry ports to the train station and you can even buy all inclusive tickets for the ferry, bus and train.
If you are in Surat Thani city, you will first have to take a local bus from the bus station to the train station.
The distance from Surat Thani to Bangkok by train is 651 km.
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All these services terminate at the main railway terminus in Bangkok, Hua Lamphong Railway Station.
If you are planning to travel north of Bangkok (ie Chiang Mai) you can get off at Bang Sue Junction as all trains heading north stop here.
Bang Sue is also close to the northern bus terminal at Mochit.
Fares for these trains vary depending on the type (and speed) of the train, carriage class, upper or lower sleeping berth and if the carriage is air-conditioned or fan cooled.