The frames are single,
and inside of one solid piece; the cylinders are outside 18 in. diameter
and 28 in. stroke; and the valve gear is of the usual shifting link
description. The boiler is of Yorkshire plates, 11 ft. 5 in. long and 4
ft. diameter, and the steam pressure is 140 lb.; while the tractive power
per lb. of steam in the cylinders is 94 lb. The fire-box is of copper, and
the roof is stayed to the outer shell by wrought iron radiating stays
screwed into both; a sloping mid-feather is placed in the fire-box.
[Illustration: FIG. 5.--GREAT NORTHERN RAILWAY.]
The tubes, 217 in number, are of brass, 1-9/16 in. diameter; and the
heating surface is in the tubes, 1,043 square feet; fire-box, 122 square
feet; total, 1,165 square feet. The fire-grate area is 17.6 square feet.
The wheel base from the center of the bogie pin to the trailing axle is 19
ft. 5 in., and the weight in working order is, on the bogie wheels, 15
tons; driving wheels, 15 tons; trailing wheels, 8 tons; total, 38 tons.
The tender weighs 27 tons. These engines are remarkable for their
efficiency; the traffic of the Great Northern Railway is exceedingly
heavy, and the trains run at a high rate, the average speed of the Flying
Scotchman being fifty miles an hour, and no train in the kingdom keeps
better time.
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