Er, even if the math is correct-
I don’t use the railways, hardly at all. £212 extra tax per year would be a great deal to me. Those people commuting for two grand a year are doing so to save accomodation etc. costs nearer to work. So what you’re really asking is a standard public choice rip-off; one group get subsidised by a theft from the general masses which is too small to incite them to revolution. The process that got us where we are today.
People who pay two grand for a season ticket are doing so because working far from home nets them more than two grand more than working nearer home. That’s their choice which they are entitled to make. Damned if I’m going to pay so they can benefit though.
One likely thing that would happen is that subsidising commuters like this would lead to more commuting. That would lead to the tax bill steadily rising, transferring ever more payments onto those who don’t commute. THere wouldn’t be any cost savings from “efficiencies”. There never are.
Very bad idea. Classic anglo-socialism, in fact.