Explanation:

It is a indigenous automatic train protection system for enhancing safety of running trains developed by Indian railways.

It controls the speed of train by automatic application of brakes in case loco pilot fails to do so.

KAVACH is based on radio frequency identification (RFID) technology. RFID uses radio waves to identify and track objects by attaching a small tag which can be read without physical contact. Range of RFID is upto 100 m.