AT&SF Class 1398 Steam Locomotive
The Atchison, Topeka & Santa Fe Class 1398 consisted of two 4-4-6-2 Mallet compound steam locomotives built in 1909 by the Baldwin Locomotive Works. The unusual wheel arrangement was only one of the oddities of these two locomotives, as the evaporative heating surface area and the Buck superheater-reheater combination were rare elements in locomotive design in 1909. Also, these two locomotives utilized an unusual feedwater heating system briefly adopted on only a few locomotives.
Another unusual feature was the Jacobs-Shupert firebox, and although all 4 cylinders used piston valves, those of the high-pressure cylinders measured 13" in diameter while the low-pressure cylinders used 15" diameter valves.
The locomotives were oil-fired and intended for passenger work with their huge 73" drivers; however, they were not successful in either passenger or freight service. One writer called them "possibly the worst" of Santa Fe's Mallets. "The front (low-pressure) engine tended to slip, quickly using all the steam from the high-pressure engine, rendering itself useless and throwing all the load on the high-pressure engine."
Both locomotives were converted to 4-6-2s in 1915.
ATSF 4-4-6-4 Overview
Classic Streamliners - TRAINCYCLOPEDIA
A hand-colored postcard featuring ATSF No. 1300, a class 1398 4-4-6-2 Mallet steam locomotive, built in 1909. Although beautiful to look at and massive in size, this class of locomotive was a total failure for the railroad.
Builders photo of ATSF No. 1300, a 4-4-6-2 Mallet.
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Text: wikipedia.org. Images: Public Domain; http://www.commons.wikimedia.org (unless otherwise specified) and 17 U.S. Code § 107 fair use. References: Lewis, Robert G. The Handbook of American Railroads. New York: Simmons-Boardman Publishing Corporation, 1951, 2nd Edition 1956. Site Map Contact webmaster HERE.