» Successful implementation at huge U.K. airport could mean more interest in PRT elsewhere.

Proponents of personal rapid transit systems have frequently promoted themselves as opponents of traditional public transportation. Unlike expensive metro or light rail systems, they claimed, their PRT lines would be cheaper to construct, more convenient for passengers, and more attractive for users. Now that a new line is readying for opening in the United Kingdom, the technology may attain new prominence.

Over the years, most attempts at implementing PRT have failed due to a lack of interest from investors — and as a

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