1927: Dispatcher Control  on the New York Central


In 1927 remote control of interlockings was brought into use between Berwick and Toledo on the N.Y.C. This was the first installation of what was later to be universally known as CTC - Centralized Traffic Control.  The dispatcher control had been developed by the General Railway Signal Co, and used the unit-wire or one-wire system, i e one wire was required between the dispatchers office and each switch (plus a common return wire). 

From Railway Signaling September 1927:































CTC

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Sidan uppdaterad den 30 januari 2007