(Minneapolis, MN)  --  Authorities have identified the railroad worker who was fatally struck and killed by a Northstar commuter train yesterday in Coon Rapids.  Fifty-three-year-old Andrew Kim Weaver of Fridley was hit in between the Northstar line's Coon Rapids and Fridley stations just before 7 a.m.  It was the first accident on the line since it began operating last November.  The train makes ten trips a day between downtown Minneapolis and Big Lake.