This is an O Scale Steam Tender ‘Dog House’ based on ones used on the Norfolk and Western Railroad’s Y6B tenders.
This model has been designed for Smooth Fine Detail materials and 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