Original sentence: An alternative was to use an iron tie bar to keep the rails to the proper gauge, incoprating a shoe in whcih the rail was fixed.Another problem was that the running surface was liable to become obstracted by stones, displaced fro the ballast
Edited sentence: An alternative was to use an iron tie bar to keep the rails to the proper gauge, incoprating a shoe in which the rail was fixed.Another problem was that the running surface was liable to become obstracted by stones, displaced from the ballast