When travelling on such short distances, you can take into account also busses and carpooling options: with some luck you will find very cheap options, even if you book on short notice.
Which stations do the trains to Bangkok leave from?
The trains to Bangkok will leave from Pra Chom Klao and will arrive at Makkasan.
What time do the trains to Bangkok leave and how long is the journey?
While the first train to Bangkok leaves at 07:11, the last one is scheduled for 18:11. The average duration of the journey is of 42 minutes, but the fastest trains can get you to Bangkok in 33 minutes.