Add Yahoo as a preferred source to see more of our stories on Google. The Capitol subway is a small, private system that connects the Rotunda with congressional office buildings.OLIVIER DOULIERY/AFP ...

Providence drew up plans as far back as 1913, inspired by the success of Boston's historic subway line. Here's why it never went anywhere.

The Capitol subway is a small, private system that connects the Rotunda with congressional office buildings.OLIVIER DOULIERY/AFP via Getty Images US Congress members have a private subway system that ...

The New York City subway system has faced many challenges in its more than a century of existence, but now there's another -- torrential rain storms that seem to pop up out of nowhere. In this edition ...