Centralized Traffic Control, known as CTC, is a device through which train traffic is controlled from a centralized position, called command position. The CTC controls the signals and detours "Detour (railway)") of a specific section through a remote connection, usually by computer means. Traffic is represented on screens where the available tracks and trains in circulation appear. The technicians have controls to establish an itinerary for each of the trains. The effectiveness of this system in avoiding the stopping of trains is such that in railway jargon it has been called dynamic detour). Railway networks can be under the protection of a CTC or leave traffic control to the circulation cabinets found in the stations along the line.

In Spain

The first section controlled by a CTC was the single track section between the Brañuelas and Ponferrada stations. It entered service in April 1954. The CTC was located in Ponferrada, and used GRS technology), of American origin.[1]​.

In Argentina

In the 1960s, in the province of Mendoza, Cuyo region, it was implemented on a trial basis on the San Martín line network, becoming the first country in Latin America to use this system. Its success promoted its implementation in the urban area of ​​Buenos Aires. It is believed that the concept of dynamic diversion was born in that country.

The most modern CTCs automatically open routes to trains, so that technicians are dedicated exclusively to traffic regulation.[1]​ The exception is the large terminals, where the opening of signals requires the continuous intervention of the Head of the CTC.