Hi, (it’s my first post soo idk what to do but I will explain what’s my problem)
I built a new train for a subway line but it seems that physics sender (Pkt/s) become lower when we sit inside the train 
I already built a train before but there’s no difference with physics sender when we stand or when we sit inside the train and that’s disturbing.
For me, when the Ave Physics Sender value are high trains are more smooth.
Here some photos:
New version: standing inside
New version: sitting inside
But with the old train: standing and sitting inside
However the new train have more parts than the old one (New: ~1500-1750 ----- Old: ~1000)
Maybe it’s a script problem but I believe that my build cause the problem.
I worked on the train for 2-3 weeks now but I can’t solve this problem.
I forgot to precise that it’s differents games: one train for one game
If you want more details or if you have a solution x) I would be happy to answer you.