Luggage on the G rail

Hello, we are planning to go from Beijing to Xian by bullet rail. I would like some more information: We have luggage/suitcases that don’t exceed the size of 76X45 CM.
1. Can we take it with us to the G train or we have to send it in other ones?
2. We are 3 people with baby - can we bring 6 bags/suitcases to the G one (2 for each)?
3. If we have a baby stroller - can we take it onboard too?