It is a fact of life that certain jobs have wage structures that seem out of kilter, especially when compared with jobs/trades that that require greater training/qualifications/responsibility/time to accomplish. The tube drivers are well protected by their unions, it's either RMT or ASLEF and no freelancers or 'foreigners' to dilute the talent pool, as in the aviation world. I'm sure that there are more young kids wanting to be a pilot than a tube driver, though that might change if it were to involve a diesel locomotive
I believe that Eurostar drivers earn comparable to a long-haul captain, so how about that ?
It's true that the tube driver must 'only' obey signals and battle endless boredom, especially in the tunnelled sections and keep to speed limits, whereas the pilots have pre and post flight duties as well as the flight itself to contend with and perhaps continual jet-lag. I suppose that it's like seeing how much NHS nurses earn in comparison with some office jobs, it bears no resemblance and it isn't fair, it's just the way things are
Merry Christmas all
SHJ