The mine-cart noises don't stop when i press "save and quit to title"

What I expected to happen was...:
once i quit the world, the mine-cart noise should stop.

What actually happened was...:
They would not stop, and I had to completely log out to stop them

Steps to Reproduce:
1. Make a circuit of rails, make sure that there are plenty of powered rails in the on-state on it.
2. put about 5-15 mine-carts on the track and get them going.
3. then when the noise gets annoying, pause and "save and quit to title"