Wow, what a mess and so tragic. Some things still don't add up. The hot box showed the train increasing in speed through the siding but how could that happen if the head end crew was asleep? Approaching a switch doing that speed seems strange and not doable. There must have been a CTC system in place to throw the turnouts, the exit should have been set the wrong way. Too many unanswered questions like why didn't the caboose guy pull the chain? I can see why he didn't get an answer on the radio if it was nap time in the cab, but when he saw the signals fly by with no sign of slowing, pull the cord!