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[quote user="tree68"] [quote user="Bucyrus"]I don’t expect this system to be universally applied to all rolling stock.  I see it only as a requirement for oil unit trains, along with many other improvements in things such as crashworthiness. [/quote] Why not unit ethanol trains?  Or trains like the "acid train" that used to run out of Canada down the line near me?[/quote] Yes, I could see this type of powered brake lock being used on hazardous material trains of all types.  But the main requirement would be that they are unit trains, and unit trains with cars that always run in unit trains.  That is because the cars would need a second air line.  So if the system were to protect against hazardous material runaways in mixed consist trains, then entire fleet of rolling stock would have to be converted to carry the brake lock and its extra air line.  The cost of that much of a conversion would be an impediment to moving forward at all.
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