To book train tickets online in Thailand, passengers can use the State Railway of Thailand's D-Ticket system through the website or mobile app. The process begins with account registration, followed by email verification and login. Travelers can then select their route, travel dates, and preferred trip type (one-way or round trip), choose their train and seating class, and complete passenger details. Seat selection is available on a visual seating chart, and payments can be made via debit/credit card or PromptPay QR code. Upon successful payment, an e-ticket is generated; travelers can access the ticket through email (as a PDF) or directly in the app for mobile boarding without printing.

Train Classes:

First Class: Features private, air-conditioned cabins for two with convertible seats for sleeping; lower bunks cost more.

Second Class: Offers sleeper and reclining seat options, available with either air-conditioning or fans.

Third Class: Provides non-reclining fan-only seats with minimal amenities, suitable for short-distance travel. Food vendors often board at major stops, especially during peak travel times.