Bad news: Just a few miles into  the trip a wheel bearing becomes overheated and melts off letting the  truck support drop down and grind on top of the rail creating white hot molten metal droppings to spew downward on the rail.

Good news: A very alert crew noticed a small amount of smoke about halfway back in the train and immediately stopped the train in compliance with the rules.

Bad news: The train  just happened to stop with the hot wheels on top of a wooden bridge built with creosote ties and trusses.

Special thanks to Ben for sending me this gem...