Captain Speaking just for the record i think senior airliner Captains are worth their 100k+ salary (if they work in an airline that pays them that) ....
It's very difficult to say who's worth what. The market (and with a few historic and declining exceptions, it's the market that sets the rates) thinks £100K is about £30 to 40K too much for that job today. What determines who gets paid what is "how much do you need to pay to attract and keep persons of the requsite skills and ability". So far, the airlines are able to attract far more peope to flying jobs than there are jobs available, even with reduced slalries and conditions, and even though candidates often have to find up to £100K up front for their licences and type rating.
As new pilots find the job is not what it was, they may become dissilussioned and leave for careers elsewhere (they are bright and ambitious people and will do well almost anywhere). If that happens, expect to see airlines improving pay and conditions, and introducing more sponsorship schemes to help with intial training costs. As I said, it's market driven.
The situation with train driving is not the same. You can't qualify for train driving school, buy yourself a train driving course, get licenced if you are good enough, get a Pendelino type rating and go to Virgin for a job, or a 66 rating and try the freight companies. It doesn't work like that. Therefore it isn't market driven. That's because, unlike the airline or the bus business, railways are not market driven. They live in a monopolistic environment on a subsidy from the taxpayer; the TOCs put up with paying drivers far more than they'd probably need to in a market-driven environment because costs on the railway are not under the same pressures as they would be in a truly competitive industry, such as civil aviation.
However, as McNulty has pointed out, this can't last. If the railways are to survive, never mind grow, they must cut costs. If they don't they will wither as lines and services are cut back as unaffordable. Probably only the London Commuter business would be difficult to replace by other forms of transport.
Those of us who like travelling by train are concerned about this - we want rail to thrive, not be choked to death by union greed.
Ask Stelios and Michael O'Leary about cutting out cost!