The Denver & Rio Grande Western Railroad bought ten 4-6-6-4s from the Baldwin Locomotive Works in 1937 to speed up its freight trains. These locomotives were designated Class L-105 and were given road numbers 3700 through 3709. They had four 23 x 32 cylinders, 70" drivers, a boiler pressure of 280 psi, a tractive effort of 105,000 lbs and ...While a large number of Challengers found service out West, 4-6-6-4s had colorful careers in the East, too. In 1942, eight Challengers were initially ordered by Clinchfield, and after the war they received four additional units. The Clinchfield Railroad also purchased six final Challenger locomotives in 1947 that the D&RGW had rejected a few ... Sep 18, 2017 · The new Trix 4-6-6-4 represents Union Pacific’s final group of Challengers built between 1942 and 1944. For its initial release, Trix’s HO model features an oil tender, and the locomotive is equipped with “wind wings” that aided the prototype in deflecting the exhaust smoke up and away from the cab. Union Pacific LEGACY 4-6-6-4 Challenger #3985 (BLACK) Challengers for the first time in American Flyer S Gauge. With the advent of diminished locomotive production due to World War II demands and restrictions, many western railroads were hungry for top performing and even more powerful steamers. In Whyte notation, a 4-6-6-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels, a second set of six driving wheels and four trailing wheels. 4-6-6-4's are commonly known as Challengers.We offer you choices for building your own 7 1⁄4 - 7 1⁄2 inch gauge live steam model of the Union Pacific 4-6-6-4 Challenger: Scaled down from original Union Pacific railroad drawings: Ensures high model accuracy. Unique among models: Largest, most powerful and only articulated model on the market. Exceptionally high quality product: Fully ...Challenger marks Lionel’s return to HO. “Challenger” is one of the more dramatic names given to any steam locomotive wheel arrangement, and the new HO scale 4-6-6-4 from Lionel lives up to that moniker. It’s a well-executed model of a well-known group of locomotives, made more famous because one of them still steams.The Union Pacific introduced the 4-6-6-4 in 1936 and ended up owning the largest and most famous fleet of Challengers. Designed as freight haulers, they were regularly used in high-speed passenger service. The line’s fleet operated well into the diesel era, with the last Challenger being dropped from the roster in 1962.Product Spotlight - HO Challenger. M.T.H. Electric Trains has begun shipping its 4-6-6-4 Challenger die-cast HO steam engine. A total of six paint schemes are being offered in standard DC 2- Rail and AC/DC 3-Rail configurations. Each model comes equipped with the most advanced sound and operating system ever installed in HO scale.Number of 4-6-6-4 "Challenger" Type Locomotives Built by Year (by Richard Duley) Railroads that used 4-6-6-4 "Challenger" Locomotives in the USA (data provided by Steve Llanso of Sweat House Media) Carolina, Clinchfield & Ohio Delaware & Hudson Denver & Rio Grande Western Great Northern Northern Pacific Spokane, Portland & Seattle Union PacificNumber of 4-6-6-4 "Challenger" Type Locomotives Built by Year (by Richard Duley) Railroads that used 4-6-6-4 "Challenger" Locomotives in the USA (data provided by Steve Llanso of Sweat House Media) Carolina, Clinchfield & Ohio Delaware & Hudson Denver & Rio Grande Western Great Northern Northern Pacific Spokane, Portland & Seattle Union PacificJLC Clinchfield TMCC 4-6-6-4 Challenger #673 (TMCC) Back by popular demand, the Joshua Lionel Cowen Series Challenger is sure to thrill and amaze you. Built with more detail than anything previously attempted in O-Gauge die-cast, this locomotive is the piece de resistance of any collection. Union Pacific had 10 two-tone gray 4-6-6-4 Challengers. These 10 locomotives were part of a group of 13 oil-burning 4-6-6-4 Challengers that UP re-assigned beginning in December 1946 from Southern California on UP's South-Central District, to the Northwestern District. The new service was between Seattle and Portland, and along the Columbia ...sc e2 bi polar sc usra 0-6-0 rk fef northern rk hudson hiawatha sc nh l5 4-6-4 rk aero train rk usra y6b sc wm challenger rk ese sc c&nw e-4 sc gp-30 sc russian dacapod sc z-6 challenger rk wabash hudson sc orient express sc gp-9 sc gg1 sc class a rk disney engine in vt sc ese hudson sc e-8 rk usra mallot sc berkshire rk p-47 baldwin sc ...Broadway Limited Imports -- 4-6-6-4 Challenger Late, Smoke Lifters, Oil Tender, Sound, DCC, Smoke - Paragon 3 -- Union Pacific 3985 (Excursion Scheme, black, graphite) -- This 4-6-6-4 Challenger features full Paragon3 sound and DCC for realistic sound and Athearn N Challenger 4-6-6-4 For N scale fans of big articulated steam locomotives, what's more exciting than a 1:160-proportion Challenger 4-6-6-4? How about one equipped with realistic onboard sound. The Challenger is the first DCC-and-sound-equipped N scale steamer in Athearn's product line.Product Spotlight - HO Challenger. M.T.H. Electric Trains has begun shipping its 4-6-6-4 Challenger die-cast HO steam engine. A total of six paint schemes are being offered in standard DC 2- Rail and AC/DC 3-Rail configurations. Each model comes equipped with the most advanced sound and operating system ever installed in HO scale. Locking your locomotive into a single operational state 4 Your locomotive’s Odyssey™ System speed control 5 Using your tender-mounted ElectroCoupler in the non-Command environment 6 Your locomotive’s RailSounds system—the basics 7 Experiencing the range of your locomotive’s RailSounds system 8 Notes on RailSounds 8See full list on american-rails.com Jan 9, 2007 · Worlds Largest Operating Steam Locomotive, Union Pacific #3985 almost a million pound Challenger class 4-6-6-4 streches her legs at speeds near 70 mph high b... These pictures, captioned the last challenger were taken June 7 1953. They show engine 1211 leading yet another westbound train out of Cumberland and up Sandpatch with mid-train helper Decapod 1130 and shoving on the rear is 4-8-4 number 1404. Only 1210 and 1211 remained on the roster that June. When talking to WM men there seemed to be only 2 ... 4-6-6-4 "Challenger" Steam Locomotives A-R.com Blog Last revised: May 11, 2023 The Challenger Type, an articulated design (meaning that either one, or both sets of driving wheels pivots to better and more safely negotiate curves), was one of the most successful large steam locomotive designs ever developed.Feb 1, 2023 · The answer was the 4-6-6-4 Challenger, devised by Alco’s engineers and UP Chief Mechanical Officer Otto Jabelman and featuring an unusually high power-to-weight ratio thanks to its large 132-square-foot grate area, boiler pressure of 280 psi, and relatively small 21 x 32-inch cylinders. The Great Northern Railway bought two 4-6-6-4s from its subsidiary, the Spokane, Portland & Seattle Railroad These two ALCO-built, former SP&S road numbers 903 and 904, were designated Class Z-6 and were given road numbers 4000 and 4001 on the Great Northern. They had four 23 x 32 cylinders, 69" drivers, a boiler pressure of 250 psi, a tractive ...Jun 20, 2007 · It combines detail, performance, and a solid sound package with a stealthy tether that makes conventional tethers look old fashioned. O GAUGE PREMIER LINE 4-6-6-4 CHALLENGER BY MTH. Price: $1,399.95 (no. 20-3241-1) Features: O-72 operation, die-cast metal construction, can-style motor, ProtoSound 2.0, coil coupler on tender. Find many great new & used options and get the best deals for AHM Challenger -4-6-6-4 -5113-05- Rio Grande -Minty Box at the best online prices at eBay! Free shipping for many products!Broadway Limited Imports -- 4-6-6-4 Challenger Late, Smoke Lifters, Oil Tender, Sound, DCC, Smoke - Paragon 3 -- Union Pacific 3985 (Excursion Scheme, black, graphite) -- This 4-6-6-4 Challenger features full Paragon3 sound and DCC for realistic sound andHO Discontinued Union Pacific Challenger 4-6-6-4; We have discontinued production of these kits. Most repair parts are available. When we exhaust these repair parts we do not plan to restock. These pictures, captioned the last challenger were taken June 7 1953. They show engine 1211 leading yet another westbound train out of Cumberland and up Sandpatch with mid-train helper Decapod 1130 and shoving on the rear is 4-8-4 number 1404. Only 1210 and 1211 remained on the roster that June. When talking to WM men there seemed to be only 2 ... Jun 17, 2021 · Union Pacific had 10 two-tone gray 4-6-6-4 Challengers. These 10 locomotives were part of a group of 13 oil-burning 4-6-6-4 Challengers that UP re-assigned beginning in December 1946 from Southern California on UP's South-Central District, to the Northwestern District. The new service was between Seattle and Portland, and along the Columbia ... All of the tenders were recycled from other (earlier) models - Long Distance Coal from the 4-6-2 Heavy Pacific, Vanderbilt from the 2-8-2 Heavy Mikado, and Centipede from the 4-8-8-4 Big Boy. The chassis is all-metal and quite hefty. As mentioned previously, the motor is an open-sided Mabuchi (3-pole / skew-wound).Number of 4-6-6-4 "Challenger" Type Locomotives Built by Year (by Richard Duley) Railroads that used 4-6-6-4 "Challenger" Locomotives in the USA (data provided by Steve Llanso of Sweat House Media) Carolina, Clinchfield & Ohio Delaware & Hudson Denver & Rio Grande Western Great Northern Northern Pacific Spokane, Portland & Seattle Union Pacific The last two Flyer steamers I tested in CTT were the plastic 0-6-0T and the Union Pacific 4-8-4 in the Feb and Sept 2007 issues. After running the new Challenger, I’d say it is time to close the door on old Flyer and embrace a new era of gear that isn’t stuck in 1962 regarding design or performance.The 4-6-6-4 was one of the most technologically advanced of its kind with advancements that allowed for both high horsepower and efficient operations. Sadly, however, like the Yellowstones the Challengers had an extremely short lifespan. Upon delivery of the UP’s first Challenger during the mid-1930s all were scrapped in short order ... Part of the April 2016 New Announcements are the CSA-1 and CSA-2 "Original" or "Light" Challengers. These were built in 1936 and 1937 for the Union Pacific Railroad and posses some key spotting features. N SCALE UNION PACIFIC CHALLENGER 4-6-6-4 BRASS MODEL KEY IMPORTS Cab Forward. Pre-Owned. $1,399.99. or Best Offer. +$16.00 shipping. Free returns. Sponsored.Reviewing my recently purchased AHM Rivarossi - ALCO Schenectady 4-6-6-4 "Challenger" road number 1506 with the Delaware & Hudson.The model is a AHM Rivaros...Jul 18, 2019 · Steam Locomotive Scale. Broadway Limited HO Scale UP Challenger Excursion #3985 Sound/DC/DCC Smoke 5821. broadway July 18, 2019 admin July 18, 2019 admin the tender drawbar pin. Now join the 6-pin connectors so they are properly seated. If the ground spring on the drawbar does not have good contact with the tender drawbar pin, the engine will have erratic or no operation. Premier 4-6-6-4 Challenger Steam Engine 66.4L HEMI Info. Chrysler introduced a production version of the crate 392 Hemi engine in the 2011 Dodge Challenger SRT8. It was a 6.4-liter V8 naturally aspirated engine, based on the architecture of the 5.7L Hemi V8. In 2014, a revised version of the 6.4L Hemi SRT became available for the Ram 2500/3500 trucks and Ram 3500, 4500, and 5500 Cab ... Sep 21, 2022 · The third option we have for 6.4 HEMI superchargers is the Whipple SRT8 6.4L Stage II Supercharger Kit W17AX 2.9L. The Whipple puts out 8 PSI at 1,600 CFM, which is good for increases of 180 whp and 180 wtq. The Whipple 6.4 HEMI supercharger kit is one of the most popular and well reviewed in the industry. Part of the April 2016 New Announcements are the CSA-1 and CSA-2 "Original" or "Light" Challengers. These were built in 1936 and 1937 for the Union Pacific Railroad and posses some key spotting features. The 4-6-6-4 class, original Challenger was designed by Otto Jabelmann of the Union Pacific and first built by Alco for UP. Approximately 230 Challengers were built nearly alike, differing only in their steam pressure, cylinders, and boilers.Feb 1, 2023 · The answer was the 4-6-6-4 Challenger, devised by Alco’s engineers and UP Chief Mechanical Officer Otto Jabelman and featuring an unusually high power-to-weight ratio thanks to its large 132-square-foot grate area, boiler pressure of 280 psi, and relatively small 21 x 32-inch cylinders. Athearn® Genesis® 4-6-6-4 "Original" Challenger. ... We are proud to announce these unique locomotives in plastic to join into our line of Genesis 4-6-6-4 steam ...All of the tenders were recycled from other (earlier) models - Long Distance Coal from the 4-6-2 Heavy Pacific, Vanderbilt from the 2-8-2 Heavy Mikado, and Centipede from the 4-8-8-4 Big Boy. The chassis is all-metal and quite hefty. As mentioned previously, the motor is an open-sided Mabuchi (3-pole / skew-wound). 4-6-6-4 Challenger. Award-winning rewards program. Great Customer Service. Hassle-Free Returns.Oct 9, 2013 · sc e2 bi polar sc usra 0-6-0 rk fef northern rk hudson hiawatha sc nh l5 4-6-4 rk aero train rk usra y6b sc wm challenger rk ese sc c&nw e-4 sc gp-30 sc russian dacapod sc z-6 challenger rk wabash hudson sc orient express sc gp-9 sc gg1 sc class a rk disney engine in vt sc ese hudson sc e-8 rk usra mallot sc berkshire rk p-47 baldwin sc ... Aug 29, 2023 · Get the current price and information for HO Steam Articulated Key Model Imports Challenger Western Pacific 4-6-6-4 by Key Model Imports (KEY) Call 352-292-4116 Mon-Thur 9am-4pm EST Model Search: In Whyte notation, a 4-6-6-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels, a second set of six driving wheels and four trailing wheels. 4-6-6-4's are commonly known as Challengers. Union Pacific Challenger No. 3985 is an example of a 4-6-6-4 locomotive.the tender drawbar pin. Now join the 6-pin connectors so they are properly seated. If the ground spring on the drawbar does not have good contact with the tender drawbar pin, the engine will have erratic or no operation. Premier 4-6-6-4 Challenger Steam Engine 6Jul 27, 2023 · Get the current price and information for O Steam Articulated Key Model Imports Challenger Union Pacific 4-6-6-4 by Key Model Imports (KEY) Call 352-292-4116 Mon-Thur 9am-4pm EST Model Search: The Union Pacific Railroad took delivery of the very first locomotive with the 4-6-6-4 wheel arrangement in 1936 when it received 15 of them from the American Locomotive Company. These newly named "Challengers" were designated Class CSA-1. In 1937, another 25 ALCO-built "Challengers" were added to the roster. This group, designated Class CSA-2 ... In Whyte notation, a 4-6-6-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels, a second set of six driving wheels and four trailing wheels. 4-6-6-4's are commonly known as Challengers. Union Pacific Challenger No. 3985 is an example of a 4-6-6-4 locomotive. The 4-6-6-4 Challenger first appeared on U This is an MTH 70-3016-1 Union Pacific 4-6-6-4 Challenger Steam Engine w/Proto-Sound 2.0, (Yellow Stripes) Cab No. 3980. In the midst of the Great Depression, Union Pacific designed and asked ALCO to build the best high-speed simple articulated engines to grace American rails. The resulting machine was a winner. UP tested the new 4-6-6-4 engine on a section of track in Utah over the Wahsatch Range. The engineer commented that would be a challenge for any locomotive, and the name stuck. UP officially called the machine the Challenger. A total of 252 Challengers were built between 1935 and 1943. UP received the most, 105.They ordered eight single-expansion 4-6-6-4s from the American Locomotive Company and took delivery of them in 1942 and 1943. They were similar to the D&H Class J "Challengers" built in 1940. These locomotives were designated Class E-1 and were assigned road numbers 650 though 657. They had (4) 22 x 32 cylinders, 69" drivers, a boiler pressure ... Jun 1, 2013 · The 4-6-6-4 was often used for passenger service, but its main function was carrying heavy, fast freight. It could average speeds of up to 70<br />. The original Challengers had 21" x 32" cylinders, 69" drivers, 255 pounds steam pressure and weighed 566,000 pounds.<br />. Aug 29, 2023 · Get the current price and information for HO Steam Articulated Key Model Imports Challenger Western Pacific 4-6-6-4 by Key Model Imports (KEY) Call 352-292-4116 Mon-Thur 9am-4pm EST Model Search: The resulting machine was a winner. UP tested the new 4-6-6-4 engine on a section of track in Utah over the Wahsatch Range. The engineer commented that would be a challenge for any locomotive, and the name stuck. UP officially called the machine the Challenger. A total of 252 Challengers were built between 1935 and 1943. UP received the most, 105.The Union Pacific Challengers are a type of simple articulated 4-6-6-4 steam locomotive built by American Locomotive Company (ALCO) from 1936 to 1944 and operated by the Union Pacific Railroad until the late 1950s. A total of 105 Challengers were built in five classes. They were nearly 122 ft (37 m) long and weighed 537 short tons (487 tonnes). Get the current price and information for O Steam Articulated Key Model Imports Challenger Union Pacific 4-6-6-4 by Key Model Imports (KEY) Call 352-292-4116 Mon-Thur 9am-4pm EST Model Search:Bowser - HO - Steam Loco Kits Union Pacific Challenger 4-6-6-4. History: The 4-6-6-4 class, original Challenger was designed by Otto Jabelmann of the Union Pacific and first built by Alco for UP. Approximately 230 Challengers were built nearly alike, differing only in their steam pressure, cylinders, and boilers. The last two Flyer steamers I tested in CTT were the plastic 0-6-0T and the Union Pacific 4-8-4 in the Feb and Sept 2007 issues. After running the new Challenger, I’d say it is time to close the door on old Flyer and embrace a new era of gear that isn’t stuck in 1962 regarding design or performance.Oct 9, 2013 · sc e2 bi polar sc usra 0-6-0 rk fef northern rk hudson hiawatha sc nh l5 4-6-4 rk aero train rk usra y6b sc wm challenger rk ese sc c&nw e-4 sc gp-30 sc russian dacapod sc z-6 challenger rk wabash hudson sc orient express sc gp-9 sc gg1 sc class a rk disney engine in vt sc ese hudson sc e-8 rk usra mallot sc berkshire rk p-47 baldwin sc ... The Union Pacific introduced the 4-6-6-4 in 1936 and ended up owning the largest and most famous fleet of Challengers. Designed as freight haulers, they were regularly used in high-speed passenger service. The line’s fleet operated well into the diesel era, with the last Challenger being dropped from the roster in 1962.Number of 4-6-6-4 "Challenger" Type Locomotives Built by Year (by Richard Duley) Railroads that used 4-6-6-4 "Challenger" Locomotives in the USA (data provided by Steve Llanso of Sweat House Media) Carolina, Clinchfield & Ohio Delaware & Hudson Denver & Rio Grande Western Great Northern Northern Pacific Spokane, Portland & Seattle Union Pacific Page 1 4-6-6-4 Challenger Steam Locomotive OPERATOR’S MANUAL Compatibility This locomotive is capable of operating on AC or DC output power supplies (See page 28 for a complete list of compatible transformers and wiring instructions.) and indoors or outdoors.451 N Nova Road, Daytona Beach, FL. 2021 Dodge Challenger R/T Scat Pack Widebody. Exterior Color: Triple Nickel Clear Coat. Interior Color: Black. Engine: 6.4L V8 Gas (485hp) Transmission:The new Trix 4-6-6-4 represents Union Pacific’s final group of Challengers built between 1942 and 1944. For its initial release, Trix’s HO model features an oil tender, and the locomotive is equipped with “wind wings” that aided the prototype in deflecting the exhaust smoke up and away from the cab.This video contains products that were purchased, provided or discounted. In most cases, products are a mix of discounted and otherwise purchased. In addit... Athearn Genesis Rio Grande 4-6-6-4 Challenger with factory MRC sound pulling a freight through Minturn, CO on my Tennessee Pass line layout.N Scale Key Imports Brass 4-6-6-4 Challenger #3985 Union Pacific UP Bob Gilmore! Opens in a new window or tab. Pre-Owned. $799.99. or Best Offer +$17.10 shipping Premier 4-6-6-4 Challenger Steam Locomotive Compatibility This engine will operate on any traditional O-72 Gauge track system, including M.T.H.’s RealTrax® or ScaleTrax™ or traditional tubular track. It is also compatible with most standard AC transformers. (See pag e 23 for a complete list of compatible transformers and wiring instructions.)Challenger marks Lionel’s return to HO. “Challenger” is one of the more dramatic names given to any steam locomotive wheel arrangement, and the new HO scale 4-6-6-4 from Lionel lives up to that moniker. It’s a well-executed model of a well-known group of locomotives, made more famous because one of them still steams.These pictures, captioned the last challenger were taken June 7 1953. They show engine 1211 leading yet another westbound train out of Cumberland and up Sandpatch with mid-train helper Decapod 1130 and shoving on the rear is 4-8-4 number 1404. Only 1210 and 1211 remained on the roster that June. When talking to WM men there seemed to be only 2 ...Jul 17, 2023 · Find many great new & used options and get the best deals for AHM Challenger -4-6-6-4 -5113-05- Rio Grande -Minty Box at the best online prices at eBay! Free shipping for many products! The 4-6-6-4 Challenger first appeared on U This is an MTH 70-3016-1 Union Pacific 4-6-6-4 Challenger Steam Engine w/Proto-Sound 2.0, (Yellow Stripes) Cab No. 3980. In the midst of the Great Depression, Union Pacific designed and asked ALCO to build the best high-speed simple articulated engines to grace American rails.Aug 29, 2023 · Get the current price and information for HO Steam Articulated Key Model Imports Challenger Western Pacific 4-6-6-4 by Key Model Imports (KEY) Call 352-292-4116 Mon-Thur 9am-4pm EST Model Search: Oct 9, 2013 · sc e2 bi polar sc usra 0-6-0 rk fef northern rk hudson hiawatha sc nh l5 4-6-4 rk aero train rk usra y6b sc wm challenger rk ese sc c&nw e-4 sc gp-30 sc russian dacapod sc z-6 challenger rk wabash hudson sc orient express sc gp-9 sc gg1 sc class a rk disney engine in vt sc ese hudson sc e-8 rk usra mallot sc berkshire rk p-47 baldwin sc ...
The answer was the 4-6-6-4 Challenger, devised by Alco’s engineers and UP Chief Mechanical Officer Otto Jabelman and featuring an unusually high power-to-weight ratio thanks to its large 132-square-foot grate area, boiler pressure of 280 psi, and relatively small 21 x 32-inch cylinders.. Jackerman mother
sc e2 bi polar sc usra 0-6-0 rk fef northern rk hudson hiawatha sc nh l5 4-6-4 rk aero train rk usra y6b sc wm challenger rk ese sc c&nw e-4 sc gp-30 sc russian dacapod sc z-6 challenger rk wabash hudson sc orient express sc gp-9 sc gg1 sc class a rk disney engine in vt sc ese hudson sc e-8 rk usra mallot sc berkshire rk p-47 baldwin sc ...The Union Pacific Challengers are a type of simple articulated 4-6-6-4 steam locomotive built by American Locomotive Company (ALCO) from 1936 to 1944 and operated by the Union Pacific Railroad until the late 1950s. A total of 105 Challengers were built in five classes. They were nearly 122 ft (37 m) long and weighed 537 short tons (487 tonnes). Union Pacific 4-6-6-4 #3985 double-heads with 4-8-4 #8444 as the pair steams through California on their way to Railfair '81 in April, 1981. Author's collection. As such, it came equipped with the latest in steam locomotive technology, was heavier than its earlier sisters, and could produce more tractive effort at 97,350 pounds with a top speed ...Find many great new & used options and get the best deals for Athearn Genesis HO Union Pacific Challenger 4-6-6-4 3982 Retail at the best online prices at eBay! Free shipping for many products!Unclebob said: I've had 4 scat packs and 2 5.7's. (I get bored lol) The 5.7 is arguably a better motor imo, although the 6.4 is faster. You really would be happy with either, as the 5.7 isn't a slouch. (The 5.7 stock exhaust sounds better too) If my choice was between a stripped down 5.7 vs. a stripped 6.4, I'd go 6.4.the tender drawbar pin. Now join the 6-pin connectors so they are properly seated. If the ground spring on the drawbar does not have good contact with the tender drawbar pin, the engine will have erratic or no operation. Premier 4-6-6-4 Challenger Steam Engine 6The Union Pacific Railroad took delivery of the very first locomotive with the 4-6-6-4 wheel arrangement in 1936 when it received 15 of them from the American Locomotive Company. These newly named "Challengers" were designated Class CSA-1. In 1937, another 25 ALCO-built "Challengers" were added to the roster. This group, designated Class CSA-2 ... Athearn Genesis Rio Grande 4-6-6-4 Challenger with factory MRC sound pulling a freight through Minturn, CO on my Tennessee Pass line layout.In Whyte notation, a 4-6-6-4 is a railroad steam locomotive that has four leading wheels followed by six coupled driving wheels, a second set of six driving wheels and four trailing wheels. 4-6-6-4's are commonly known as Challengers. Union Pacific Challenger No. 3985 is an example of a 4-6-6-4 locomotive. Union Pacific LionMaster TMCC 4-6-6-4 Challenger #3983. $ 799.95. Find A Dealer. Imagine the world’s largest and most famous steam locomotives running on your layout of O-31 radius track. A fantasy?While a large number of Challengers found service out West, 4-6-6-4s had colorful careers in the East, too. In 1942, eight Challengers were initially ordered by Clinchfield, and after the war they received four additional units. The Clinchfield Railroad also purchased six final Challenger locomotives in 1947 that the D&RGW had rejected a few ....