For N modeling, use the Atlas or Life-Like model. Note the lettering. No models of this class are available in any scale. Many modelers enjoy weathering their hoppers but have a difficult time knowing what to do when it comes to the interiors of coal hoppers. This photo shows the full interior of a modern Conrail hopper.
Thumbnail shows only portion of photo.
Note the mix of oxide, gray, rust, and black. Don't forget the coal dust in the bays. Shave off upper length of ladder on model and replace with grab irons to create more accurate model. All cars were built 9-66. For HO modeling, use the Bowser predecorated or the Life-Like model.