This is an Ambroid H-12 Heritage Line NKP 50 Ton Composite Hopper with trucks and Kadee Couplers attached.  It is ready for your tracks, right out of the box  The original box, with some extra decals and padding.  A great addition to any collection of rolling stock. I have another one up for sale too.  They look great together.
Note:  I noticed te brake wheel had come off so I put it back on after the photos.
This is the first of 2 NKP Hoppers I have listed today.
These are great kits and teach you so much about kit building.  I have built the entire Ambroid line of cars starting with the general issues cars, the 1 of 5000 cars series 1 and 2, plus the Heritage line of which this is part of.  All teach you how to make pretty easy to build but unusual and outstanding cars.  I would recommend that you use white glue rather than Ambroid glue though.  If you make a mistake you can just take some rubbing alochol and soak the joint to loose it back up without destroying the glued surfaces..