I was wondering if anyone had an idea how to model this loco? I belive that Microscale makes decals for this. You can get info for it on wikipedia if you search GP 16. Here are some pics: 
I just found this site that seems to give quite a discritsion of how to gp16. Check it out.
http://www.rockinghamjunctionmodels.com/forum/index.php?topic=1357.0
Thanks bgardener