1. Industrial Engineering and Operations Research, Indian Institute of Technology Bombay, Mumbai 400076, India;
2. Railway Board, Rail Bhavan, New Delhi 110001, India;
3. Centre for Railway Information Systems, Chanakyapuri, New Delhi 110021, India;
4. Department of Electrical Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India;
5. Department of Mechanical Engineering, Indian Institute of Technology Bombay, Mumbai 400076, India