I was working on a railway themed game of mine and I found out the physics are being a little bit freaky.
In the following screenshot, I’ve made a 60 degrees slope of two tracks with different carriages on them, both of these carriages has most of their parts set massless and has an openable door system using constraints like hinge and prismatic constraints.
But when I tried to run test the game, the first carriage (single wide side door) moves slower than the right despite having lesser part count, lesser doors and uses exactly the same base, the issue can be seen in the video below.
I’ve tried removing the constraints which operates the doors, reducing part count, making more parts massless as well, but none I’ve done solved the problem anyway.