Railway Minister Ashwini Vaishnaw has reviewed the progress of the advanced version of the Automatic Train Protection System (ATP) Kavach 4.0 at the Rail Bhawan here, officials said on Monday. Kavach 3.2 version is being installed on approved high-density routes, the railway officials said, adding that upgrading and installation of the latest version on new routes will go on simultaneously to cover a wider railway network in a shorter period. They said Vaishnaw reviewed the progress of Kavach 4.0 on June 22. "The three manufacturers of Kavach who are in the advanced stage of testing version 4.0 presented its progress report to the minister," a senior railway official said. After reviewing it, the minister directed that Kavach installation be taken up in a planned manner in mission mode as soon as it is ready, he added. The railway ministry maintains that the development of Kavach is a significant milestone in railway safety. In the past, Vaishnaw stated on several occasions durin