In what appears to be an officially filmed and released video, a group of female train attendants in uniform, complete with rolling suitcases for props, do a group dance in the middle of one of the station halls. Their dance is followed by a group of male train attendants, also in uniform, dancing — and then they all join together in one big, happy dance.
The spectacle of employees performing dances in public is common in Chinese cities — walk down any street and you'll find groups of hairdressers, waitresses, and clothing-shop employees performing what we can only call "service dances," ostensibly for marketing purposes and usually led by a manager, in front of their shops.
The train station video is simply titled "Chengdu passenger station's 'post-90s' train attendants flash mob to celebrate the opening of a new train line," and it seems such a phenomenon is not unique to Chengdu's train stations, either, as evidenced by related video links of similar dances in airports and train stations in cities across the nation.
The only thing we're left wondering is whether "good dance skills" was on the job application.