 The Machinists writer, Scott Kossar, loves "Nine Inch Nails" and  his original script had a quote from their lyrics on the first page.  He always wanted the soundtrack to be written by NIN, but the  director didnt want the movie to go in that direction. Nine Inch  Nails only official member is Trent Reznor, thus the name of  Christian Bales Character, Trevor Reznik.