1. Aradau C (2010) Security that matters: Critical infrastructure and objects of protection. Secur Dialogue 41(5):491–514. https://doi.org/10.1177/0967010610382687
2. BBC News: belarus: explosion at minsk metro system. https://www.bbc.com/news/av/world-europe-13042262. Accessed 02 Mar 2021
3. BBC News: brussels attacks: zaventem and maelbeek bombs kill many. https://www.bbc.com/news/world-europe-35869254. Accessed 02 Mar 2021
4. Carlson AH, Frincke D, Laude MJ (2003) Railway security issues: a survey of developing railway technology. In: Proceedings of the international conference computer communication control technology, vol. 1, pp 1–6
5. CEIC: India Length of Railways: Running Track Kilometres. https://www.ceicdata.com/en/india/length-of-railways-running-track-kilometres. Accessed 18 April 2021