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Hello wkhey...'jacking-up' the independent air valve on the engineers console used to be done on our 2.2% grade in the Cascade Mtn. range. Our near runaway was on said grade between Scenic and Skykomish Washington. An 'allen-head' wrench was needed, and inserted into the end of the valve and turned in what direction I forget, to increase the independent pressure to hold the train when stopped to enable charging the air brake system before a long decent. Other methods were backing-in to the train while stopped, or setting 'retainers' as you probably know. Backing-in, and allen-head wrenching were strongly discouraged as you probably guessed. The former being extremely hard on Traction-Motors etc. But under difficult circumstances on Mtn. grade, you might need to be a little creative. The locomotives I believe were of the GP-30 variety, but it was some years ago and I have forgotten some of the details...Take Care...Hommie
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