Train Sim World - Breaking Physics

Normally on Train Sim World, if you derail or collide with another train the simulation stops. Apparently I broke this. Here is how it happened: I was traveling at about 60mph along the track. Four locomotives in front, a lot of coal cars, and two pusher locomotives in back. On 3rd person view I was able to orbit the first locomotive. When I clipped between the cars, I was able to decouple the first and second locomotive. Instantly the following train stopped. I kept moving in the primary locomotive. I applied the brake and stopped. I wanted to get out and go survey the situation. However, I forgot to keep the brake applied and slowly the locomotive started rolling backward. Also, for whatever reason, I decided to remove the gas cap. Just for giggles. After running a while the stopped train despawned. This was odd, so I went back to my primary locomotive. It was right behind me because it was moving downhill. I was still able to jump on and soon it managed to hit the not despawned cars