But why should non-performance related pay rises go beyond inflation? If all organisations did that (in your perfect world), it would only increase costs for consumers, thereby driving up inflation, thereby meaning higher pay above this new inflation, thereby driving up inflation..... and so on.
The best way to do it would be to make non-performance related pay rises up to the inflation rate and not above, but obviously this is impossible to police (and also impossible to determine the perfect inflation rate), but my point is that wanting a society where everyone is handed out huge pay rises willy nilly is one sure way to cause a big economic bust.
As I see it, the transport unions can keep with their demands on pay (i.e. if its true that they are blocking ideas to stop using RPI to set fare inflation as it has a direct effect on wages), but if rail services keep going up at the current rate in costs in fares, its only going to stop people using them (either by relocating, using their car, or using tech to work from home), then the unions will end up having more problems in that rail companies will be making cuts on staff to save money. And, during all this, the leaders of said unions still get paid a handsome sum from their members' fees to protect them from these problems that are being caused by said merry go round.
TL;DR Its the long term sustainability that needs to be thought about.