Most visitors never buy a ticket. They cross to the viewing platform (观景台) opposite the pierced 楼, lean on the selfie rail, and wait for Line 2 to perform the same pierce locals use for commuting.
Notice the anthropology: elbows fight for the center frame; someone films vertical; a train arrives and half the crowd lowers phones in the same second. The station keeps selling transit; the rail across the street sells the meme. Both jobs share one façade.
坝 in the place name still hints at older ground — a riverside flat under hillside streets — but the modern ritual is simpler. Hold the rail, catch one carriage, leave before the next tour group seals the angle.