This is a pair of Steam Tender ‘Dog House’ based on ones used on the Norfolk and Western Railroad’s Y6B tenders.
These models have been designed for FUD & FXD materials.
If printed in the FUD & FXD materials material they 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.wordpress.com