Kavach, the TCAS, is big, really big!
The system of Signalling on Indian Railways(IR) India is based on the conventional Absolute Block System, which in simple terms, means that in a block section between two stations, only one train can be permitted. Since this imposes serious restrictions on line capacity, Automatic Signalling is provided in suburban areas which has a signal every kilometre and therefore larger number of trains can be operated in the section. These systems depend entirely on the vigilance of the driver to sight the signals and run the train accordingly and is, therefore, prone to human error. The issue of upgrading the systems to have an intelligent system, which can alert the drivers about the signals and route parameters ahead, and override any erroneous action or inaction by them, has been under consideration for decades. The Signalling systems in countries with developed railways have advanced to systems with significantly-reduced human element. In Europe, since trains cross from o...