On Friday President Joe Biden signed legislation to block a rail shutdown that could have devastated the American economy.But the deal he approved did not include paid sick days for workers, a key sticking point for unions in contract talks with five major U.S. railroads.Kate Monahan, a director at Trillium Asset Management, the socially minded investor that filed the resolution at Union Pacific, said more flexible sick time would have broader benefits like reducing workforce turnover.Resolutions about worker welfare have drawn more support at corporate annual meetings in recent years amid the COVID-19 pandemic.Railroads worry implementing paid sick leave would require more employees at a time when many have cut their workforces dramatically."