Efficiency is always a function of usage. Electric rail lines have a much lower average demand for electricity. Here the efficiency of rail actually works in the opposite direction where battery power trains and electrified roads mean significantly less total battery needs.

Consider in terms of electric highway usage, a car every 100 feet isn’t that dense and get’s you to a steady state of ~20kw * 5280/100 = 1MW of power for several hours a day. Electric trains have higher peak demand vs cars, but it’s on a very infrequent basis.

Of course every car isn’t EV and right now ~0 cars can use in road power delivery. But, that’s just a chicken and egg problem not an issue with the technology.