На
http://www.seat61.com/Thailand.htm и в других источниках пишут, что бронировать билет на поезд по e-mail
passenger-ser@railway.co.th можно не позднее чем за 15 дней. НО на днях я получил вот это:
Dear Sir/Madam
we would like to let you know that the reservation from abroad must be
made
at least 20 days before traveling Please make the reservation by
yourself at the train station.
We apologize for the inconvenience caused.
Your sincerely,
Passenger traffic section