Siam is a BTS interchange station in Bangkok where the Silom Line and Sukhumvit Line meet, located in the Siam area among shopping malls and hotels. The station has four floors, with platforms on the third and fourth floors facing different directions, allowing a same-level transfer when the destination matches. A luggage storage room sits at the entrance of Gourmet Market, and announcements give locations in Thai followed by English. The large number of passengers boarding and alighting makes the station crowded.