The 9000s could haul a mile-long train at 50 mph, twice the speed of the Mallet articulateds they replaced. Known as a Union Pacific type for their wheel arrangement unique to the U. The 9000s were also the most successful three-cylinder rod locomotives ever built in the United States. The third cylinder was placed between the two outside cylinders and drove a rod connected to the second axle, which was shaped like a crankshaft rather than a straight axle. A pair of hinged rods driven off the outer cylinders, and clearly visible on the pilot deck in front of the cylinders, operated the third cylinders valve gear a design borrowed from English locomotives like the Flying Scotsman, and known as Gresley valve gear.The rest of the middle cylinders machinery, however, was not so visible or accessible, and tended to receive less than the optimal amount of attention from shop crews. Despite the maintenance headaches of the third cylinder, however, the 4-12-2s proved versatile and dependable.
9000 was saved from the scrapper and resides today at the Los Angeles County Fairplex in Pomona, CA. New for 2009, the UP 9000-class joins the other historic locomotives that have graced the M. Featuring incredibly smooth operation as slow as 3 scale miles per hour and a correct six puffs and chuffs per driver revolution, our die-cast 4-12-2 boasts the wealth of added-on details you expect in an M. Model including operating third-cylinder Gresley valve gear on the pilot. The item "HO MTH Die-Cast Union Pacific 9000 2 Rail DC withDCC, Sound, Smoke 80-3298-1" is in sale since Friday, April 16, 2021.This item is in the category "Toys & Hobbies\Model Railroads & Trains\HO Scale\Locomotives". The seller is "sell_sa" and is located in Fort Lauderdale, Florida. This item can be shipped worldwide.