Better still, it's ready-to-run right out of the box - no "do it yourself" detailing required. The gear motion is absolutely perfect - no wobbling, shimmying or shaking whatsoever. It pulls like an elephant and runs quiet as a mouse. Pick-up is perfect, throttle response is perfect, slow speed creep is perfect, and, well, the whole thing is just plain perfect... Overall, these are sensational locomotives - and certainly right up there with the all-time greats of N scale steam.The item "Athearn 4-6-6-4 Challenger Union Pacific #3707 (22920) DCC with Tsunami Sound" is in sale since Sunday, January 20, 2019. This item is in the category "Toys & Hobbies\Model Railroads & Trains\N Scale\Locomotives". The seller is "njrailcollector" and is located in Jersey City, New Jersey. This item can be shipped to United States.