This is a replacement drive gear for an N Scale Minitrx 9F.
This model has been designed for FUD and FXD Materials.
If printed in the FUD or FXD material it will require cleaning before painting. I recommend washing with warm soapy water then soaking in 'Goo Gone' or a similar non-corrosive product for 24 hours. Then rinsing off with warm water and allowing to dry.
For more information please see my blog - www.jamestrainparts.com