Trains with a guard become driver-only trains, which then become driverless trains. That's the fear underlying Aslef's dispute with Southern railways and accounts for the rearguard action to prevent further job losses across the rail industry. There is also scorn for Southern's management, which has attacked drivers' basic terms and conditions, and there is anger at transport secretary Chris Grayling's anti-union stance. But, at its heart, the dispute is over the status and even the very existence of the job of train driver, which has been around for nigh on 200 years. Like most people, train drivers will have read the screaming headlines warning of a robot revolution that spells the end for millions of jobs.