Builder Baldwin Locomotive Works
Serial number 54477
Build date January 1921
Configuration 4-6-2
Gauge 4 ft 8 1⁄2 in (1,435 mm)
Driver diameter 73 in (1,854 mm)
Weight on drivers 180,000 lb (82,000 kg)
Locomotive weight 300,000 lb (140,000 kg)[1]
Fuel type fuel oil
Boiler pressure 210 psi (1.4 MPa)
Cylinder size 25 in × 30 in (640 mm × 760 mm)
Tractive effort 45,850 lbf (203.95 kN)
Operator Southern Pacific
Class P-8
Number in class 15
Delivered April 15, 1921
Retired February 7, 1957
Current owner Golden Gate Railroad Museum
Disposition Operational at the Niles Canyon Railway