We have technology in the US that would allow this. This is the same as texting a question to the call center and getting response back, as implemented and used by some of the internet retailers.

The Times of India reports anyone needing help during a train journey can send a SMS to a designated number and a government railway police constable will show up at their side!
The new system also will allow passengers inside trains and at railway stations to post complaints and request police assistance.

