A video of the pulling power of the new Intermountain HO Tier 4 GEVOs

https://www.facebook.com/InterMountainRailway/videos/1463145893746456/

I am going to build a freelance N scale layout that will represent the Norfolk & Western operations in North Carolina and Virginia in the mid-late 1950's.

I am finding it difficult to find N scale Norfolk & Western diesels (DCC ready) for that period, such as RS-3, RS-11 and GP9, among others.  Can anyone tell me where I can find them? 

Will I have to decorate loco's myself?

Thanks.

I have been designing and selling 3D models in various scales on Shapeways for a while.  Is more a Hobby than a business, and I enjoy it.  Recently, however, I bought a home 3D printer kit for $168 from China- an Anet A8.  It's made with the cheapest parts available, and I've had to spend about $40 in repairs and up grades,and for the first two weeks all I did was print parts to make the printer better.    

There are certain models that are as good on the PLA printer, and a lot cheaper than the Shapeways alternative.  

A friend has asked me to build a couple of Westerfield covered hoppers for him. I am trying to use CA as the instructions recommend but the glue is not holding the parts together. I thought there may be some mold release on the parts and they need to be cleaned. However, some of the parts are very small and I am afraid of breaking them or loosing them if I try to wash them.

Any words of wisdom on gluing the kits or washing them would be appreciated.