WRONG! I had debate with my friend on this one, and he tried to prove me but found out I was right.
Train is most efficient of all, planes and cars are the same, and the worst efficient of all.
Care to prove me wrong, eh?
Did you know that freight rail gets about 420 miles per gallon per tonnage? For every 1 ton of load, they get 420 miles per gallon WHILE car, weights about 1.5 ton and the best one (Turbo Diesel) gets 47 miles per gallon.
The reason why trains are most efficient is because of mass, of course it requires energy to start up but once on cruising speed, it does not need much energy.
Whats more, it is on magnetic, meaning less friction due to zero contact on ground, and magnetic field is used to make train run while plane requires jet engine which uses more energy to pull the air though. It is not that efficient as you think it is.
The only real benefit of using plane is convenience, and speed.
What a waste of infrastructure. Planes are the most efficient means of high speed transportation.