; front drivers, 14 tons 4 cwt.; rear drivers, 13 tons 10 cwt.;
total, 37.75 tons. The tender weighs 25 tons in full working order. The
boiler pressure is 150 lb., and the usual point of cut-off in the high
pressure cylinders, when running at speed, is half-stroke, while the
pressure of steam admitted to the large cylinder is never to exceed 75 lb.
per square inch. The average consumption of coal between London and Crewe
is 26.6 lb. per train mile, or about 8 lb. per mile less than the standard
coupled engine. In an experiment made in October, 1883, one of these
engines took the Scotch express from Euston to Carlisle at an average
speed, between stations, of 44 miles an hour, the engine, tender, and
train weighing 230 tons, with a consumption of 291/2 lb. of coal per mile,
and an evaporation of 8.5 lb. of water per pound of fuel.
Mr. Webb's object, in designing this engine was to secure in the first
place a greater economy of fuel, and secondly, to do away with coupling
rods, while at the same time obtaining greater adhesion, with the freedom
of a single engine. The cost is much more than an ordinary locomotive, but
the saving in fuel is said to be 20 per cent. over the other engines of
the North Western Rail way.
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