I acquired a 1980s Amtrak set that is missing several pieces.  I was wondering if anyone could tell me which set this is and maybe which pieces are missing.  The set contained a Amtrak E60CP engine and 3 passenger cars.  The power pack is missing (part no. 6605), the track is missing and there is 2 empty slots in the box.  Any help would be appreciated, thanks.

I picked up this set from an older man, it came with the locomotive and cars but not the track or power pack.  The power pack box has item number ae44-6605.  Can someone point me to where I can get these items?  Thanks.