Light rail transit advocates are closer to winning legislative approval for an LRT line in Minneapolis. Lawmakers trying to iron out Minnesota House and Senate spending differences are being told the operating cost of bus and rail service along Hiawatha Avenue are about the same. Advocates say answering the operating cost question is a big step toward convincing lawmakers and the governor that LRT from downtown Minneapolis to the airport is feasible. Minnesota Public Radio's Dan Olson reports. The agreement reached in a legislative conference committee gets at the long running controversy over what is cheaper to operate - bus or LRT. Minnesota Department of Transporation director of intergovernmental policy Bill Schrieber says his agency and the Metro