Subway commuters in Shenzhen, China, may soon need to make room for a fleet of chunky, snack-carrying delivery robots. Earlier this week, more than three dozen autonomous, four-wheeled delivery robots boarded and exited active subway trains, and eventually delivered packages to several 7-Eleven convenience stores. The initiative is part of a broader effort in China and other countries to normalize the presence of delivery robots operating in public spaces. Shenzhen’s subway system is massive. Last year, the New York Police Department officially retired a roaming egg-shaped security bot that patrolled subway stations following backlash from commuters and privacy advocates.