The wheel base is,
leading to driving wheels, 8 ft. 6 in; driving to trailing wheels, 9 ft.;
total, 17 ft. 6 in. The boiler is of Lowmoor iron, 10 ft. 6 in. long and 4
ft. 2 in. outside diameter. The grate area is 17 square feet, and the
heating surface is, tubes, 1,1451/2 square feet; fire-box 133 square feet;
total, 1,2781/2 square feet. The boiler pressure is 140 lb. on the square
inch, and the tractive power per lb. of mean pressure in cylinders, 92 lb.
The weight in full working order is, engine, leading wheel, 10 tons; ditto
driving wheels, 14 tons; ditto trailing wheels, 9 tons 10 cwt.; tender,
with 40 cwt. coal and 2,600 gals. water, 26 tons 10 cwt.; total, 60 tons.
These engines are extremely simple, but well proportioned, and are a very
handsome type, and their average consumption of coal, working trains
averaging ten coaches, is about 24.87 lb. per mile. The standard coupled
passenger express engine on the narrow gauge has inside cylinders 17 in.
diameter and 24 in. stroke; the coupled wheels are 6 ft. 6 in. diameter,
and the leading wheels 4 ft.; the wheel base is 16 ft. 9 in. The frames
are double, giving outside bearings to the leading axle, and inside
bearings to the coupled wheels.
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