BEAT THE DC METROWashingtonians, get ready to walk, pedal or Uber it. Officials from the Washington Metropolitan Area Transit Authoritythats the agency that runs the buses and trains of the nations capital cityare about to close the citys metro system, second-busiest in the country, for 29 hours. Underground electrical cables caught fire Monday, and WMATA brass says they cant guarantee it wont happen again.We cannot send...