A Broad Street Line extension has been on Philadelphia’s wish list for years. A 2014 report on transportation access to the site predicted that engineering could begin this year. The expected price tag was much smaller — up to $400 million — at a news conference in 2015 in which Mayor Jim Kenney, U.S. Sen. Pat Toomey, and recently indicted union boss John J. Dougherty all threw their weight behind an extension. At that time, construction was predicted to begin by the end of this decade. The project has not progressed much since then.