2 days at Shanghai , 2 days at Beijing ,Mumbai to Shanghai and back by Air

I am a little confused what you wanna know? Anyway, the high speed trains between Beijing and Shanghai operate between Beijing South and Shanghai Station and Hongqiao Railway Station. U are recommended to book the round trip tickets in advance.

In Shanghai, you cannot miss the Bund and Huangpi River, Yuyuan Garden, Xin Tian Di and Oriental Pearl TV Tower. In Beijing, you should go to Forbidden City & Tiananmen Square, Temple of Heaven, Summer Palace and Badaling Great Wall for a visit.

Let me know if anything else you wanna know.