The RMT union said train managers and senior conductors voted for action as they felt the firm was trying to undermine the role of train guards.
https://www.bbc.co.uk/news/uk-england-59753749
I don't want guards on my train. I don't even want a bloody driver on my train. I'd be more than happy with an automated driverless train. The thing that prevents my train from traveling is invariably the damned staff failing to show up for work, it's not the train itself.