WASHINGTON, Dec. 13 (TNSFR) -- The U.S. Department of Transportation Federal Railroad Administration has issued a safety advisory to stress the importance of verifying that the "track is clear" before railroad equipment pushes or shoves across highway-rail grade crossings. This advisory specifically targets crossings equipped only with flashing lights or passive warning devices. Recent fatal accidents involving Union Pacific Railroad Co., Omaha, Nebraska, Watco Rail Services, Pittsburg, Kansas,  more