Two S Helper Service two-bay hoppers, weathered for coal service. The one on the left is a composite car painted in a PRR "war bonds" scheme, while the black one is a steel hopper finished for the CNJ. I created the rusting in the steel car (and on steel parts of the composite car) using Bragdon weathering powders. The wood sides on the PRR car have had coal dust ground into them - hence the black interior panels.