Video: PV Sindhu ranked 7th highest-paid athlete; Serena tops list

State-of-the-art Train 18 to replace Shatabdi Express soon; PV Sindhu on Forbes' list of top 10 highest-paid female athletes; Air India seeks Rs 500 crore urgently to repay banks; opposition criticises Centre's decision to decline foreign aid for Kerala flood  relief. Watch more in this episode of Business Wrap.