Chicago Transit Authority President Forrest Claypool assured transit advocates Wednesday that CTA and Mayor Rahm Emanuel are “doing everything we can” to extend CTA’s Red Line from 95th Street to 130th Street, a project floated since the Dan Ryan Expressway opened in the 1960s. But Claypool also called the federally-dictated process to get the necessary cash and environmental regulatory approval “onerous” and could not estimate when construction might start.