This is an outside
cylinder bogie engine, with cylinders 181/2 in. diameter and 26 in. stroke;
the driving and trailing coupled wheels are 6 ft. 6 in. diameter, and the
bogie wheels 3 ft. 3 in. The wheel base to the center of the bogie pin is
18 ft. 6 in.; the heating surface is, in the tubes, 1,112; fire box, 104;
total, 1,216 sq. ft. The weight of the engine in working order is 42 tons.
[Illustration: FIG. 7.--MIDLAND RAILWAY.]
The Midland Railway route to the North is distinguished by the heavy
nature of its gradients; between Settle and Carlisle, running through the
Cumberland hills, attaining a height of 1,170 ft. above sea level, the
highest point of any express route in the kingdom; and to work heavy fast
traffic over such a line necessitates the employment of coupled engines.
The standard express locomotive of this company has inside cylinders 18
in. in diameter and 26 in. stroke. The coupled wheels are 6 ft. 9 in.
diameter, and the leading wheels 4 ft. 3 in., the total wheel base being
16 ft. 6 in., and the tractive force 104 lb. for each lb. of mean cylinder
pressure. The boiler is of best Yorkshire iron, 10 ft. 4 in. long and 4
ft. 1 in. diameter. The grate area is 17.
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