the tractive force per pound of mean cylinder pressure 106 lb.; the total
wheel base is 14 ft. 6 in. The boiler is 10 ft. 2 in. long and 4 ft. 4 in.
diameter, and the heating surface is in the tubes, 858 square feet;
fire-box, 90 square feet; total, 948 square feet. The engine is furnished
with wing tanks holding 860 gallons of water, and carries 30 cwt. of coal.
The weight in working order is 38 tons. These engines have taken a maximum
load of twenty-five coaches between London and Brighton, but are mainly
employed in working the suburban and branch line traffic; their average
consumption of coal is 23.5 lb. per mile, with trains averaging about ten
coaches.

Another example is Mr. Webb's tank engine on the North-Western Railway,
which presents a contrast to the foregoing. It has inside cylinders 17 in.
diameter and 20 in. stroke, coupled wheels 4 ft. 6 in. diameter, and a
tractive power per lb. of mean cylinder pressure of 107 lb.; the wheel
base is 14 ft. 6 in. with a radial box to the leading axle; the heating
surface is in the tubes, 887; fire-box, 84; total, 971 square feet; the
weight in working order is 35 tons 15 cwt. The engine is fitted with
Webb's hydraulic brake, and steel, manufactured at Crewe, is largely used
in its construction. The consumption of coal-working fast passenger trains
has been 28½ lb. per mile. There are many other types, such as the ten
wheel bogie tank engines of the London, Tilbury, and Southend and
South-Western railways; the saddle tank bogie engines, working the broad
gauge trains on the Great Western Railway, west of Newton; and the
familiar class working the Metropolitan and North London traffic. But the
same principle is adopted in nearly all--a flexible wheel base to enable
them to traverse sharp curves, small driving wheels coupled for adhesion,
and wing or saddle tanks to take the water. One notable exception is,
however, the little six wheel all-coupled engines weighing only 24 tons,
which work the South London traffic, burning 24¼ lb. of coal per mile,