This is why a loco pilot doesn’t stop train in case of emergency 

As general people are not familiar with the technical part associated with a loco pilot and other circumstances, it is obvious that a question like why a loco pilot doesn't apply breaks well in advance will arise in their minds. 

Passenger train

Incidents of trains crushing people as well as animals under wheels are occurring almost every day. And hearing such sad news, it is quite typical that a question-why the loco pilot didn’t apply brake well in advance may come to our mind. 

As general people are not familiar with the technical part associated with a loco pilot and circumstances, it is obvious that such questions will arise in their minds.