Mick Lynch schooled BBC Radio 4's Justin Webb on the meaning of 'driver-only operated' trains this morning (6 December), during a debate on the upcoming Christmas rail strikes.
"The guards are still there... driver-only operated trains surely have a 2nd person on the train", Webb says.
"No they don’t", Lynch chimed in, insinuating that driver-only means exactly that, and he considers them 'less safe'.
The new strikes are set to take place from 6pm on Christmas Eve until 6am on 27 December.
Click here to sign up for our newsletters.