O Scale Williams Electric Trains, Union Pacific, 4-8-8-4, Big Boy, 4020, #8001, Crown Edition,All brass construction, Used, original box,

O Scale Williams Electric Trains, Union Pacific, 4-8-8-4, Big Boy, 4020, #8001, Crown Edition,All brass construction, Used, original box, Original production has issues with worm drive matching with gears, this loco has had this corrected.