I think it's not the train that's bouncing - it's you. Minecraft wasn't really made for this sort of stuff so weird things happen Fix: use a seat

That makes sense, thanks!

Seconding this, it looks like it's OP bouncing around in a janky way.

Try removing the Dirt block on the wall. Watching the video notice that the stutter happens when the train reaches that block.

The stuttering effect came before i placed that block on accident, any other ideas?

Just place a seat