Subway tunnel heat-exchangers could heat and cool thousands of nearby apartments

In Numerical investigation of the convection heat transfer driven by airflows in underground tunnels (Sci-Hub mirror), a group of engineers from L'Ecole Polytechnique Fédérale de Lausanne and the Swiss Federal Institute of Technology propose that low-cost heat-exchangers placed in subway tunnels could be used to heat and cool homes essentially for free (the system would last 50-100 years, and the pumps would need replacing every 25 years). Read the rest

SpaceX launches Hyperloop pod design competition geared for students and indie engineering teams

The high-speed ground transport system was first described by Elon Musk in a 2013 white paper, and its first route would connect Los Angeles and San Francisco with an expected journey time of 35 minutes.

The death of the steetcar

In 1920, most of us used public transport. But the decline of the great American streetcar is about more than the automobile: "By the time [GM] was buying up these streetcar companies, they were already in bankruptcy." Read the rest