Rail passengers disrupted again (BBC News)
 

Thousands of rail commuters in south-east England once again face severe delays because of unofficial action by drivers.

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The drivers are refusing to work overtime the blame is entirely with the train operating company.
If they employed enough drivers in the first place there would be no need for overtime.
Yes I know under certain operating conditions overtime may be required but to what extent.?

If their contract does not require them to work overtime, it is entirely voluntary and if they decide not to, they are not taking unofficial action.

No sensible employer would organise their business by having to rely on the goodwill of their staff voluntarily deciding when they are going to work overtime. It's a recipe for disaster.