All six Santa Fe 4-6-4's were remarkable locomotives. They were built by Baldwin Locomotive Works in Philadelphia in 1937 (Nos. 3460-3465). The first was Santa Fe's first and only streamlined steam locomotive. She was nicknamed "Mae West" because of her curvy figure and also the "Blue Goose." All six had 310 lb. boiler presssure and 84" drivers (just 4" shorter than the diameter of their boilers), and force feed lubrication. They resembled condensed 4-8-4's rather than elongated 4-6-2's.
To accommodate 90-foot turntables, their tenders were tall and rectangular. They contained 20,000 gallons of water and 7,000 gallons of fuel oil. They were designed for service on moderate grades of the Eastern Lines between Chicago and La Junta, Colorado.
On December 12, 1937, No. 3461 completed a test run that is believed to be the longest ever by a steam locomotive in regular service. She arrived in Dearborn Street Chicago, with mail and express train No. 8, after a run of 2,227.3 miles from Los Angeles, California. This train consisted of a dynamometer car and 10 to 12 steel cars, a total trailing load of 737 to 939 tons. This run usually required four locomotives plus helpers.
No attempt was made for a speed record. The elapsed time was 53 hours, 40 minutes. About 4 hours 35 minutes were spent at stations en route, loading and unloading mail and express and cutting cars in and out . The running time was 49 hours, 5 minutes at an average speed of 45.4 mph. The highest speed was 90 mph.
They had Worthington feedwater heaters rather than Elesco with its prominent tank across the top of the smokebox front. The 685 in 1953 was an accurate model. Lionel added a smokebox front with an Elesco tank in 1954, probably to distinguish the 665/2065 from New York Central Hudsons 646/2046.
Lionel added an angular 6026W tender with a coal pile instead of a fuel tank. Some plain, boxy prewar (pre-World War II) tenders resembled a 3460 tender, but Lionel probably wanted a detailed tender that looked different from the streamlined Pennsylvania Railroad tender behind the NYC Hudsons and later steam turbines.
Lionel 685/665/646 small Hudsons require frequent oiling, especially a drop or two on armature shafts, gear hubs and axles. When they "run dry" of lubricant they can slow down and screech. But they are easily taken apart and serviced. The armature needs an occasional cleaning, too. If brushes wear down or the brush springs get weak, replacing them will improve operation.