It's nail biting time for Twin Cities rail boosters. Federal officials reviewing Minnesota's request for money for the Hiawatha Avenue light rail line assume the state will share the cost. But Last week, members of a key Minnesota House committee approved a transporation bill which does NOT include the $60 million the governor and other rail supporters seek. A version of the bill still alive in the Senate includes the money. Light rail supporters worry that failure to win state money will push Minnesota to the back of the funding line.