Athearn - The Union Pacific CSA (Challenger Simple Articulated) Challengers were the first 4-6-6-4 steam locomotive built by American Locomotive Company for the Union Pacific Railroad. Two orders of “original” also known
![Athearn N RTR 4-6-6-4 Challenger with DCC and Sound No 3985 Steam Locomotive Model - Black (11802) for sale online | eBay Athearn N RTR 4-6-6-4 Challenger with DCC and Sound No 3985 Steam Locomotive Model - Black (11802) for sale online | eBay](https://i.ebayimg.com/images/g/wIkAAOSwQm1lNviv/s-l1600.jpg)
Athearn N RTR 4-6-6-4 Challenger with DCC and Sound No 3985 Steam Locomotive Model - Black (11802) for sale online | eBay
![Sold at Auction: Athearn N scale 22920 Union Pacific 4-6-6-4 Challenger #3707 steam locomotive w/ Tsunami sound and DCC Sold at Auction: Athearn N scale 22920 Union Pacific 4-6-6-4 Challenger #3707 steam locomotive w/ Tsunami sound and DCC](https://image.invaluable.com/housePhotos/stout/15/706715/H2651-L268452342.jpg)
Sold at Auction: Athearn N scale 22920 Union Pacific 4-6-6-4 Challenger #3707 steam locomotive w/ Tsunami sound and DCC
![Broadway Limited Imports Brass Hybrid HO 4805 Union Pacific Class CSA-2 'Early Challenger' 4-6-6-4 'Post 1947 Re-built Front Engine' with Paragon4 Sound/DC/DCC & Smoke - UP #3830 Broadway Limited Imports Brass Hybrid HO 4805 Union Pacific Class CSA-2 'Early Challenger' 4-6-6-4 'Post 1947 Re-built Front Engine' with Paragon4 Sound/DC/DCC & Smoke - UP #3830](https://cdn11.bigcommerce.com/s-ni2nh1gs68/images/stencil/1280x1280/products/66070/214702/BLI-Paragon4-HO-Early-Challenger-3__31500.1640190205.png?c=2)