 It was the curves on these early lines that, a century later, would lead to British Railways' experimentation with, and later introduction of, tilting trains.Although the Government was in favour of the development of trunk railways to stimulate economic recovery and to facilitate the movement of troops in times of potential civil unrest, it was legally necessary that each line be authorised by a separate Act of Parliament.While there were entrepreneurs with the vision of an intercity network of lines, such as those through the East Midlands, it was much easier to find investors to back shorter stretches that were clearly defined in purpose, where rapid returns on investment could be predicted.