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(CTC was first introduced on the NER's busy MG section between Gorakhpur and Chupra, and later on the Bongaigaon-Changsari section of NFR.) The suburban section of Madras Egmore - Tambaram also has CTC.
Busy urban areas have electronic interconnections among the signal systems of the stations within the areas.
Other than the block system some other special-purpose methods of train working are used in some circumstances.
AWS (Automatic Warning System) is an in-cab signal warning system, is used in suburban EMU systems, primarily Mumbai.
It was proposed for main lines including New Delhi - Agra, Howrah - Mughalsarai, etc.
The clearing point is the point ahead of a stop signal up to which the track must be kept clear of obstructions in order for a train to be accepted from the rear of the signal.
In most cases this is with reference to home or outer home signals guarding entrance to station limits from a block section.