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[quote user="Euclid"]Why would the CSX experts calculate in a way that disadvantaged the engineer who they were in court to defend?[/quote] There are two extreme ways you can do it. You make all assumptions in favor of the engineer. Even if the result is an impact the assumption are at least disputable. Or you take the earliest possible start of braking and everything else delivering the shortest braking distance and show that even under best conditions an impact was unavoidable. Nothing to dispute but in this case a low impact speed. in the later case you have to show the imponerabilia like when was the engineer able to realize the danger, brake delay times, brake propagation rate, weather condition etc. [quote user="Euclid"]In my mind, they have no credibility. Their service application calculation sounds fishy.[/quote] I think for such a judgement we know too little about the calculation itself or the line of defence. Today's software is relatively good if you know all details of the train. And who had them if not CSX? There are still assumptions involved but by varying them you might get a good result. In Germany such calculations are used to determine the maximum allowable speed of a train to keep its stopping distance below the block length of 1,000 m (3,281 ft). Regards, Volker
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