Pete from Oz seems to have some 'limitations' in his own mind.
It'll never work!
"In Bavaria the Royal College of Doctors, having been consulted, declared that railroads, if they were constructed, would cause the greatest deterioration in the health of the public, because such rapid movement would cause brain trouble among travelers, and vertigo among those who looked at moving trains. For this last reason it was recommended that all tracks be enclosed by high board fences raised above the height of the cars and engines.
Rail travel at high speed is not possible because passengers, unable to breathe, would die of asphyxia."
- Dr. Dionysus Lardner (1793-1859), Professor of Natural Philosophy and Astronomy at University College, London.