The AI boss that deploys Hong Kong's subway engineers

JUST after midnight, the last subway car slips into its sidings in Hong Kong and an army of engineers goes to work. In a typical week, 10,000 people carry out 2600 engineering works across the system – from grinding rough rails smooth and replacing tracks to checking for damage. People might do the work, but they don't choose what needs doing. Instead, each task is scheduled and managed by artificial intelligence. Hong Kong has one of the world's best subway systems.