Santa Fe No. 3765

Santa Fe #3765, despite being the class leader for this specific class of 4-8-4, was not in fact the first member of that class to be delivered. It's shipment from Baldwin had been delayed due to the engine receiving modifications for streamlining that never came to be
In 1938, the Santa Fe took delivery of both the 3460 Class Hudsons and and the 3765 4-8-4s, and the plan was to have both 4-8-4 #3765 and 4-6-4 #3460 be streamlined. While they they went ahead with streamlining 3460, creating the iconic "Blue Goose", 3765 was not streamlined due to the railroad struggling to keep the locomotive's weight within their specified parameters. The streamlined shrouding added just enough weight to the engine that it exceeded those parameters.
3765 did receive some modifications in preparation for the streamlining, including nickel silver handrails and a different style of headlight from the one traditionally used on the 4-8-4s, but the engine itself was never streamlined. Like the 3460, it was intended to be used on the new stainless steel, lightweight passenger trains West of Kansas City, and presumably the streamlined shrouding would've been 100% identical to 3460s.
In the end, 3765 carried on with it's career, business as usual hauling freight and passenger trains out of Kansas City. It was retired in the mid 1950s and scrapped by 1962.