IR commissions Kavach 4.0 on 2,633 route km (rkm) of Delhi-Mumbai and Delhi-Howrah routes till July 31, 2026 August 6, 2026 | News & Developments, S & T Indian Railways (IR) has commissioned Kavach 4.0 on 2,633 route km (rkm) of high density Delhi-Mumbai and Delhi-Howrah routes…… This content is restricted.