It is beholden on unions to act on behalf of their members, but they have to act responsibly. Yes, I know they are concerned about jobs, but this is plain stupid. If I was in charge I would sack them all (union members that is). Normally my political sympathies are left of centre. We cannot behave as if we lived in the 1800s. This is the 21st century for goodness sake.
See http://www.bbc.co.uk/news/uk-england-38296623 .
See https://en.wikipedia.org/wiki/Luddite . The Luddites were textile workers and weavers who destroyed machinery in the hope of preventing job losses. We have to be efficient - end of story.
Southern Rail union members - grow up!!