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If you work for the RR, or are able to hack in, laptops can indeed do this for you in the field. Was visiting Arizona and California last month, and while spending a few days at Cajon, a certain RR guy showed me his "mobile Digicon" setup. Same track schematic the DS sees, with symbols, signal aspects, etc. Ten years ago I dreamed that there would be a day when such things were possible, and sure enough... Of course, it's out of reach for most of us.
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