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I thought there were at least a couple of engineers who insisted that shutting down the engine could not have caused a brake release.  So it sounds like the trainline was at a reduced pressure to have set the brakes; they shut down the engine; a little leakage from one or more car reservoirs leaked into the trainline; and slightly raised its pressre; that triggerd a full release of all car brakes, and away went the train.   What about the independent brakes?  Would the full release of the train brakes also release the independent brakes?
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