Information about a n scale train set for a german girl! Need HELP!!!

[chrimi]

Hi, I'm from Germany and need your help.
I got from an estate a Bachmann nscale Electric Train set. GP 40 Diesel and 5 cars set complete with power pack. Item No. 4326 Santa Fe.
The locomotive has the stamp of Hong Kong.
My question: How old is this set? Does it have a collector's value?
Many thanks for your help and sorry about my bad english!!!

[Bucksco]

http://www.bachmanntrains.com/home-usa/board/index.php/topic,21665.0.html