Deng Qiqi launched her business at the bustling Shapingba Subway Station in Chongqing, southwestern China, on February 14, Shandian News reported. She usually opens at around 5pm and close at 7.30pm.

But the staff seemed to know what they were doing. At Subway, I asked my sandwich artist whether I could take pictures, and then I ordered a 6-inch Subway club sandwich on nine-grain honey-oat bread.