CBC reported on a runaway train car that rumbled through Regina, SK early Wednesday morning (article here). After about 15 minutes, the car stopped itself about 4km away, after crossing several busy streets.
I’ve made a simulation here. I used the default truck model provided by Cesium. The animation takes the full 15 minutes to run at 1x speed, so you may want to speed it up using the green arrow in the control at bottom left.