The Crime Scene

I stumbled upon a horrific scene today that I just simply cannot explain. There were no witnesses, and judging by the nature of the accident I did not initially believe that there were any survivors either. Who was at fault here? Was it simply driver error, or is there more to the story?
Don't be alarmed though, later in the day Johnny was spotted climbing in and out of a circus train so despite the gruesome scene, he apparently emerged from the accident unharmed. The fellow without a body, however, may not have fared so well. I have not seen him since.