The history of Columbia is laden with this kind of satisfying, train-spotting historical detail.

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Meanwhile, in the two under-river tubes that cross between Exchange Place and the World Trade Center, PATH workers have jury-rigged a system of walkie-talkies and train-spotting staffers to get service there running at all.

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Companies are also improving technology to enhance inventory tags, and are using CD-ROMs to train employees interactively on spotting suspicious behavior.

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