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With special arrangements, it could be done now. The Washington, DC Metro subway is operated by computer. There are no road crossings, and the right of way is completely fenced in. An attendant rides the lead car to observe the route ahead, but his main job is to be sure the passengers have cleared the doors before they're closed. He's got manual overrides, but mostly he just sits there. The same could be accomplished with a freight railroad, but fencing in 2000 miles of railroad and eliminating all road crossings is a tall order. But still, the technology is there now. Remember, the Digital Age is now upon us. Your computer can be set up to run a complex model railroad with no human hands (if the trackwork is worthy!) It wouldn't be too difficult to automate a freight railroad as far as the electronics go; the problem is making it not a problem to its neighbors.
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