English: Atchison Topeka & Sante Fe Railroad engine 3003, a mallet locomotive on the tracks outside Winslow, Arizona in 1913-14. "The first 2-10-10-2s were constructed in 1911 by the Atchison, Topeka and Santa Fe Railroad at a cost of $43,880 each. They were built out of existing 900 & 1600 class 2-10-2s with new front engines and tenders from Baldwin. They were used between Bakersfield and Barstow and up to San Bernardino. The railroad built 10 of these engines, which were cobbled together by the Santa Fe using existing 2-10-2 engine units united with low-pressure engine units supplied by Baldwin. Baldwin also designed and built the unusual "turtleback" tender that probably was designed to improve rearward vision.

A distinctive ribbed firebox trailed the long boiler. Like other Santa Fe Mallets, the actual tube length was relatively short, but a "reheater" ahead of the forward tube sheet and boiler joint was supposed to maintain steam heat as it traveled forward to the high-pressure cylinders. It added 2,659 sq ft, but was nowhere nearly as efficient as later superheater designs. The design was unsuccessful and the engines were converted back to 2-10-2 simple-expansion locomotives in 1915-1918." Santa Fe 2-10-10-2 Locomotives

Personal picture taken by railroad telegrapher Harold B. Phelps Sr. As his sole heir, I give permission for use under the license below.