Original sentence: Although the positions of Train Controller and Signalman were always distinct from the inception of the former in 1907, Train Controllers perform work previously executed by Signalmen and Station Masters.In many railways, modern technology has seen the positions of Signalman and Train Controller united (or reunited).Irrespective, the Telephone Train Control system has been generally abolished, with a few exceptions
Edited sentence: Although the positions of Train Controller and Signalman were always distinct from the inception of the former in 1907, Train Controllers perform work previously executed by Signalmen in some cases.In many railways, modern technology has seen the positions of Signalman and Train Controller united (or reunited, in the sense that traffic regulation and train path allocation was originally the role of the Signalman anyway).Irrespective, the classic Telephone Train Control system has been generally abolished, with a few exceptions