OMGosh I too have become obsessed with the song "Train to Satanville" and the elusive Gin Gillette! I discovered it this last Halloween whilst compiling music for my radio show. It's great to find this request by M. Campbell as it is the closest I have come to finding someone sharing my interest. 
I found this interesting story about it but ironically the writer actually did not want to know anything about her! Here is the link to that:
http://www.factmag.com/2011/07/26/on-record-andrew-weatherall/
Please let me know if you uncover any further information. 
Cheers, B'anna