Which of the following is a key feature of the Kavach 4.0 system that Indian Railways plans to roll out?

Kavach 4.0, an updated automated train protection system by Indian Railways, is set to begin its roll-out in October. The initial deployment will focus on upgrading 10,000 locomotives and covering over 9,000 route kilometers, particularly on the Delhi-Howrah and Delhi-Mumbai routes. The roll-out will prioritize sections with automatic signaling, and the coverage will eventually extend to other key routes, such as Delhi-Chennai and Mumbai-Chennai. The system aims to enhance safety and efficiency in train operations but does not include the ability to operate without onboard staff or involve drones, nor does it drastically reduce installation costs to ₹10 lakh per locomotive.