Eastbound NS train derailment just east of the park. Looks like around ten autoracks mid train. https://www.mytwintiers.com/news-cat/re ... ew-ok/amp/
Moderator: Otto Vondrak
Roscoe P. Coaltrain wrote: ↑Mon Jun 15, 2020 10:33 am From another forum:
"Dragging detector announced Emergency stop, so head end NS #310 with 212 cars with distributed power went from notch 8 to dynamics brake notch 8, but had been using trip optimizer and the DPU was a DC drive set and did not react the expected way of killing power. End result of head end braking and mid unit in full power was pushing off the auto racks within the train. Result of PSR. May be time to cash in the stock and take the capital gain hit while there is some left. The real cause of what was dragging had not been specified."
Sounds like the responding unit on the rear DPU was one of the 9200 series Dash9s that are not Trip Optimizer equipped. I guess the programming code is only as good as an algorithm that covers all possibilities.