Original sentence: But this route's largely straight lines made introduction of high-speed service simple; on other lines, like the West Coast Main Line from London to Glasgow, the rails had numerous curves that would push the passengers about when travelling at high speeds.During the 1960s British Rail experimented with a number of technologies in order to increase the performace of their passenger service.High-speed service on the East Coast Line from London to Edinburgh demonstrated that passenger traffic responded favorably to high-speed service
Edited sentence: In a car this isn't noticeable because the passengers are normally seated, while in an aircraft the act of turning banks the aircraft so that the two forces lie in the same line.In a train running on a flat rail, however, walking passengers will be subject to these forces, and even a small amount of centrifugal force acting across the height of the body can make it difficult to walk.When a vehicle turns it generates centrifugal force acting across the vehicle