D7303 is a bullet train operating from Haikou East Station to Sanya. And it is searched that the train’s departure time is 08:40.

I'm looking for G train routes in and around China. Specifically from Shanghai to the Xian area. Can you point me in the right direction?

What train route would you suggest from Shanghai to Xian, incorporating a ride on the G Trains? Please advise

On Shanghai-Xian route, there are no G trains but only some common fast trains and express trains available. If you insist on taking G trains, you could take one G train to Nanjing first and then reach Xian by another train. Or, you could take a D train to Zhengzhou first and then take a G-train to Xian. And the second route sounds better.