What China did was side benefits of huge electronic industries supply chain which allowed it to install cameras at vast. Cameras need repair replacement frequently- unless you have wherewithal to maintain and replace them - installation being pointless. Case in point speed/violation cameras. They go kaput frequently - only to be replaced/repaired on next financial year.China was able to put in over 1 million CCTVs and implement nationwide facial tracking system. It was not just on railroads but practically all over the place. What I am asking is much smaller in scale than what China pulled off.
In India - it was once same with traffic lights or playthings in park- once broken it used to take long time to repair or replace. As manufacturing strength along with financial muscle grew - you see more of them getting replaced when damages at better frequency.
Sabotages are happening for many years. Earlier their were common ammo dump fires too. As economic muscle grows - so will India be able to protect itself better.