The UK usage is terrible with only 10% using the train to commute, in Wales it's only 3% of the population comute on by train. I have been one of those 3% in the past and it wasn't too bad for me as a way of getting into the City Centre, it was certainly cheaper than parking.
By gong on strike those 3% will get another chance to work from home, they or there employers might think actually this works meaning it could reduce to 2.something.
I have been a union member in every job, but striking should be a last resort, I dont think they will win the public over with this and I think this strike was a mistake.