Rivarossi N - 9157 - 'Big Boy' Mallet Class 4000 – largest steam locomotive in the world - of the Union Pacific Company number: 4005 Pulled tender locomotive, Class 4000 (Mallet), Type 4-8-8-4 [(2´D) D2´], ´BIG BOY´ From Era III - Union Pacific Largest steam locomotive ever built, hence the name "big boy". Brand Rivarossi, cat.no 9157 This model is in good condition. The lighting on the front works, the locomotive drives neatly. Only 1 step is missing on the tender (photo 9), and the traction tires were dried up and removed (photo 14). For the pulling force that makes hardly any difference. In the lid of the box some cracks. Will be sent by registered mail, pictures are part of the description