Sam Yan MRT Station

The token machines are the thing to know about. There are four, one or two are often out of service, the interface makes you click around a system map with a mouse, and the lines at rush hour are long enough to wreck your plans. The fix is simple. Use a stored-value card, or tap a Visa card at the gate, which this station accepts. There are ATMs on site too if you need cash first.

Beyond that it's a genuinely useful stop on the Blue Line in Pathum Wan. Underground tunnels run straight into Chamchuri Square and Samyan Mitrtown, so you can reach Chulalongkorn University and both malls without surfacing into the heat or the rain. That alone makes it worth routing through. Surface at the right exit and you're looking at Hua Lamphong Temple. There's also a small park by the station with a view over the city skyline, which is a decent way to kill twenty minutes between connections.

Access is good. Elevators and escalators throughout, dedicated gates for wheelchair users, and staff who step in to help when needed.