Hi there
Regarding North West Frontier, I live close to the line where it was filmed in Andalusia, Spain and have a website www.gssr.es about the company that built the line. There are many photos of the line between Guadix and Hernán-Valle here: http://www.gssr.es/slideshow2.php?Ref=HV-GX and the penutimate station (http://www.gssr.es/slideshow2.php?Ref=ZF) and Iznalloz station in the finale (http://www.gssr.es/granada-guadix.php?Ref=GRX-GRAN). The site includes the history of The GSSR and much more.
I hope you find it interesting.