I would say some RMT members are decently remunerated - that is the WHOLE POINT. I would suggest many ( perhaps not train guards) are not. I bet most of their members are not train guards. It is very frustrating when people seem unable to grasp that simple point. I also didn't realise that earnings defined your class or your political views.
Railway staff are on the whole decently paid. You only have to look at careers pages, look at the skills required for some jobs, and then see what other jobs people might be doing. It's not a race to the bottom argument, but I'm saying that railway wages are high for the marketplace. Of course the unions can claim great credit in helping push wages northwards. A good thing.
I wasn't referencing class or political views - just saying that when the RMT come out with the class struggle bullcrap it's entirely counterproductive. People instantly switch off, and it portrays the RMT as mud-slingers. (Which, to be fair, they are).