This “HO” scale Union Pacific 4-8-8-4 “Big Boy” tender locomotive fleet number 4004 was introduced by Rivarossi in 1994 (cat. ref. 1584). This model is in new and un-used condition. It has been serviced and is now being sold in running order. The front of locomotive lighting unit is working and the handrails for the cab-sides remain in the un-opened package along with an alternative coupling. The model has the original boxing and separate trays for the engine and tender, which are all in good condition. There is an exploded parts diagram alongside a parts coding schedule, and a separate maintenance and brief history leaflet.