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Larry: Interesting comparison you make to emergency services. It allows me to illustrate the difficulty of railroad operation. My wife was a paramedic and later a paramedic dispatcher for the city of Fort Worth. They dispatched using GPS and an electronic map of the city, just like you see in Phoenix. She thought railroad dispatching would be about the same, right? Wrong. <br /> <br />In her words, "railroad operation is more than 100 times harder than ambulance and fire apparatus dispatching." Part of the problem is that railroads have one degree of freedom (forward and reverse) and used a fixed guideway, whereas rubber-tired apparatus have two degrees of freedom and a self-steering guideway. Thus, railroad operation is all on absolutes, all of the time. A train absolutely owns a section of track, and has absolute boundaries. GPS has fuzzy boundaries.
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