India, April 19 --  Critical cybersecurity vulnerabilities in systems linked to RailTel Corporation of India have raised fresh concerns over the security of India's expanding surveillance infrastructure, even as recent police investigations reveal how CCTV networks are being exploited for espionage.

RailTel, a public sector undertaking under the Ministry of Railways, operates one of the country's largest telecom and digital infrastructure networks, providing connectivity, data centre services and surveillance backbone support across railway stations and government systems. Its network underpins communication systems used in railway operations and increasingly supports CCTV-based monitoring across public infrastructure.

A security a...