These are repaints of RSC's SD40-2 Hi Nose. You must own the DLC to use this repaint.
You can purchase it at http://store.steampowered.com/app/208354
Install the RWP file with the Railworks Package Manager. Then you must copy the sd40_2_highhood.GeoPcDx file from
Assets\RSC\SD40HnPack01\RailVehicles\Diesel\SD40-2H\Default to Assets\RSC\SD40HnPack01\RailVehicles\Diesel\SD40-2H\NERW\Engine
Then you must copy the sd40-2_cab_Def2.GeoPcDx from
Assets\RSC\SD40HnPack01\RailVehicles\Diesel\SD40-2H\Default\CabView to Assets\RSC\SD40HnPack01\RailVehicles\Diesel\SD40-2H\NERW\Cabview
In the editor they are referenced as NE - SD40-2 HighNose & NE - SD40-2 HighNose NC for the "no crew" version.
This package is released as freeware, you can do whatever you wish with it EXCEPT make money with its use. It is FREE!