The number that really puts this all into perspective comes from the Wikipedia page on LGV Sud Est. The french high-speed line from Paris to Lyon. The total area of the train line is 16km². By comparison Charles de Gaul airport is 32km². Trains are an incredibly efficient use of space
To throw in another data point. Disneyland Paris has approximately 200000m² of carpark. And they've covered it with solar panels. Local to where the power is needed, no faffing with safety critical systems.
12/n