First one: Mexico. No "dump" after this "thump"...
In the comments are recurring references to the Troublesome Trucks (from Thomas the Tank Engine) chanting "Faster, Faster, Faster" 
No word on where these cars ended up, and passerby seemed mostly unperturbed as a set of unattended boxcars goes thundering down the line after the tanker passes through.
Then there's this one in India, considerably less dramatic looking, till you remember this is a 22-car passenger train with about 1000 people onboard, that managed to roll seven miles before being stopped, supposedly after officials piled ballast on the tracks:
---PCJ
