The labor saving advantages of carrying 100 people on the same vehicle are so enormous that there is little motivation if any to quit paying conductors and engineers.
That's not a valid argument given that it is just as feasible to price individual transport out of the market while simultaneously raising the price for public transport in such a "capitalist oligarchy". Fossil fuel companies will again go on a public transport buying spree, this time around with the intention of keeping the trains rolling while raising prices to the point of maximum profit.