From TiTan TT in Australia!
The Northern Pacific's modern steel Woodchip gondolas/hoppers were built by Thrall Car Co. in 1966 to carry woodchips from Northwestern lumber mills to industries using woodchips in products, such as: Chipboard, cardboard, and paper.  These 2-12-2 panel cars were in NP series 115500 to 115699.
The TiTan TT kit contains cast resin body; etched brass ladder and brake wheel details, and TiTan TT decals.  Less trucks and couplers...