The City: Right Side of the Tracks

As urban land grows ever scarcer and more expensive, planners are increasingly turning their eyes skyward to the unused space overhead. And when they survey the city, the airspace that stands out most is that over open railroad tracks and highways.

A start has already been made toward tapping this new urban dimension. In Boston, the Prudential Center is built on top of the Massachusetts Turnpike. In Manhattan, four high-rise apartment buildings have straddled the approaches to the George Washington Bridge since 1963. Chicago's 41-story Prudential Building rose over the Illinois Central...

Want the full story?

Subscribe Now

Subscribe
Subscribe

Get TIME the way you want it

  • One Week Digital Pass — $4.99
  • Monthly Pay-As-You-Go DIGITAL ACCESS$2.99
  • One Year ALL ACCESSJust $30!   Best Deal!
    Print Magazine + Digital Edition + Subscriber-only Content on TIME.com

Learn more about the benefits of being a TIME subscriber

If you are already a subscriber sign up — registration is free!