we are a couple and we will travel on G (first class) and then on Z one (soft berths).

Here are some doubts after read your article:
1. Is that 20kg limit for all kind of trains and tickets?
2. Can i sum boths tickets and check one 30kg baggage?
3. Our big bag is more than 200cms length , if i pay, could i check it anyway? or i cannot transport it ?
4. Do you know if on soft berths i can have my big baggage with me ?

Thanks ! great site !