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[quote user="riprap"]To perhaps regurgitate, most of the posts which explain a location where crewless trains have been possible, the common link is that all of them are without any grade crossings or contact (presumably) with pedestrians and the like.  You may remember that just a few years ago,  they finished the project down in LA where a triple track, dedicated freight line btw the Port of Long Beach and the rail yards of (then) SP, (then) SF and UP.  Once, let's say, a transcontinental RR develops, and achieves economies of scale that another RR might not, what's to keep them from (eventually) eliminating all grade crossings, putting a concrete wall around the whole shebang, then eliminating the crews?  Yes, of course, it would take time, but wouldn't that absolute cost be smaller than the absolute cost of paying labor to do its job? Riprap[/quote] Well, perhaps someday.  Not in the forseeable future.  If it was feasible, it would be in progress or done already.  The improvements such as barriers and grade separation would easily exceed $1 million per mile.
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