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Infrastructure and energy Economy, finance, and budgets Why are American rail projects so costly? The initial results of an ambitious project by three researchers at New York University’s Marron Institute suggest one culprit hiding in plain sight: pointlessly fancy train stations. On December 9, the NYU researchers Elif Ensari and Eric Goldwyn, trained as urban planners and architects, and Alon Levy, a mathematician and author of Pedestrian Observations, a widely read public transit blog held a panel discussion on the project’s first case study: the Green Line Extension (GLX) built by Boston’s public transit authority, the MBTA. In principle, GLX is simple. It extends an existing light-rail line 4.3 miles into Boston’s inner suburbs, mostly in a trench that already holds commuter rail tracks. But GLX’s costs ballooned after planning began in 2006, reaching $3 billion in 2015 more expensive per mile than most subways.

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