The thing that bugs me about trains is just how under-utilised the track is. I live half a mile from the west coast line and half a mile from the M6. On a Monday or Friday rush hour, I cross the M6 and the number of passengers/hour passing the bridge is huge. Going over the railway bridge and the line (and Stafford station) is virtually deserted.
What’s more, train lines take people to where they want to be (town centres) unlike airports and motorways which terminate way outside.
Rip up the track, tarmac them and make them available to cars and freight which have automated speed, steering and distance sensors so they will automatically travel in convoy until you reach your destination. Although, how you wake the driver up when you get there is another matter.