Just for fun, Specs on the Challenger
From the 1950-52 Locomotive Cyclopedia:
Clinchfield 4-6-6-4 Challenger:
Number built: 8
Date: 1943
Weight on Drivers (in lbs): 420,000
On front truck: 79,000
On trailing truck: 108,000
Total Engine: 607,000
Tender (2/3 loaded): 316,900
Wheel Bases (ft - inches)
Driving, each: 12 - 2
Engine, total: 59 - 11
Engine and tender, total: 106 - 8
Driving Wheels, Diameter: 69 inches
Cylinders, diameter & Stroke (inches): 22x32
Boiler
Steam Pressure (lbs. per sq. in.): 265
Diameter (first ring): 94 9/16 inches
Firebox, L x W (inches): 213 1/32 x 108 3/16
Tubes (number and diameter): 222, 2 1/4
Flues (number and diameter): 60, 5 1/5
Grate area (sq. ft.): 108
TENDER
Water Capacity (US Gallons): 22,500
Fuel Capacity (tons): 26
Trucks: 6 + 6
GENERAL DATA
Tractive Force, engine, lbs: 101,120
Piston Speed (@10 mph, in feet): 259.7 (*there is no time reference for this data, so I'm not sure how to interpret this one!)
Up next: The Big Boy!