USRA COPIES RAILROAD QUANTITY CLASS ROAD Clinchfield D&RGW N&W N&W NP
N&W 2012 N&W 2012 is switching coal hoppers at Roanoke, Virginia, on September 15, 1947. — Louis A. Marre collection
Other railroads receiving cop- ies of the USRA heavy 2-8-8-2 after the war included the Clinchfield, Denver & Rio Grande Western, Northern Pacific, and Virginian. D&RGW received ten locomo- tives of USRA 2-8-8-2 design from Alco at Richmond in 1923. These class L-107 engines were assigned to work over the Soldier Summit grade between Salt Lake City and Helper, Utah. The four Northern Pacific copies were classed as Z-4 and were assigned to work out of Livingston, Montana, as pushers
Virginian 15 10 10 30 10 4
L-107 L-3
Y3a Y3b
through the Bozeman Pass and tunnel. The Clinchfield and Vir- ginian used their locomotives in heavy coal traffic.
Z-4 USB
721-735
N&W continued development of large compound 2-8-8-2s be- gun with the Y2 and Y3 and, in 1930, introduced the Y5 as the first “modern” 2-8-8-2. Boiler pressure was increased to 300 psi, and these engines had the “waffle-iron” nozzles for the low- pressure cylinder exhaust that re- duced back pressure. They also had a prominent external steam
NUMBERS 735-744
3500-3509 2050-2079 2080-2089 4500-4503
bridge pipe that formed a shallow, inverted “V” between the two front cylinders.
The next improvements re- sulted in the Y6 series (Y6, Y6a, and Y6b). The Y6-series engines had integrally cast cylinders in cast-steel frames, roller bearings on all axles, and piston valves as large as 18 inches in diameter. However, the main point is that the Y6 series was still a modified USRA 2-8-8-2 and, thanks to the 30 years of improvements, was a machine capable of 5,600 draw-
Later reclassified as Y4 REMARKS
72 RAILROAD MODEL CRAFTSMAN
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