Killing Keystone seen as risking more oil spills by rail

    By Rebecca Penty & Jim Efstathiou Jr.     A rejection of the Keystone XL pipeline by President Barack Obama would push more of Canada’s $73 billion oil exports onto trains, which register almost three times more spills than pipelines.     The March 29 rupture of an Exxon Mobil Corp (XOM). oil pipeline in...