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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

Power and type: Mallet Compound Articulated Steam
Whyte Specification: 4-4-6-4
Class: 1398
Road Numbers: 1300, 1301. Later changed to 1398-1399.
Serial numbers: 33708, 33776
Gauge: Std gauge
Number Built: 2
Builder: Baldwin Locomotive Works
Year built: August-September 1909
Valve Gear: Walschaert
Locomotive Length and Weight
Driver Wheelbase: 30.33 ft
Engine Wheelbase: 51.92 ft
Ratio of driving wheelbase to overall engine wheebase: 0.58
Overall Wheelbase Engine and Tender: 94.46 ft
Overall Length Engine and Tender: 105 ft
Axle Loading - Maximum Weight per Axle: 59,000 lbs
Weight on Drivers: 268,016 lbs
Engine Weight: 376,850 lbs
Tender Loaded Weight: 223,550 lbs
Total Engine and Tender Weight: 600,400 lbs
Tender Water Capacity: 12,000 U.S. gals
Tender Fuel Oil Capacity: 4,000 U.S. gals
Minimum weight of rail: 89 lb per yd
Driver Diameter: 73 in.
Boiler Pressure: 200 psi
High Pressure Cylinders: 24" x 28" (diameter x stroke)
Low Pressure Cylinders: 38" x 28" (diameter x stroke)
Tractive Effort: 53,697 lbs
Factor of Adhesion: 4.99
Heating Ability
Firebox Area: 202 sq ft
Grate Area: 52.70 sq ft
Evaporative Heating Surface: 3,477 sq ft
Superheating Surface: 328 sq ft
Combined Heating Surface: 3,805 sq ft
Career:
Operator: AT&SF
Locale: North America
Disposition: Converted to 4-6-2s in 1915

See also:

Steam Locomotives

Mallet Locomotives

AT&SF

Baldwin Locomotive Works

Builders photo of ATSF No. 1300, a 4-4-6-2 Mallet.

Classic Streamliners - TRAIN​CYCLOPEDIA

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A hand-colored postcard featuring ATSF No. 1300, a class 1398 4-4-6-2 Mallet steam locomotive.

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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