wheels, and cylinders varying
between 17 in. and 18 in. diameter and 24 in. to 26 in. stroke; the grate
area is about 17 square feet, and the total heating surface from 1,000 to
1,200 sq. ft.; the average weight in full working order varies from 30 to
38 tons. One noteworthy exception occurs, however, on the Great Eastern
Railway, where a type of goods engine with a pony truck in front has been
introduced. The cylinders are outside 19 in. diameter and 26 in. stroke,
there are six coupled wheels 4 ft. 10 in. diameter, and the pony truck
wheels are 2 ft. 10 in. diameter; the total wheel wheel base is 23 ft. 2
in., but there are no flanges on the driving wheels. The boiler is 11 ft.
5 in. long and 4 ft. 5 in. diameter, the boiler pressure is 140 lb., and
the tractive force per lb. of mean cylinder pressure 162 lb.; the grate
area is 18.3 square feet, and the heating surface is in the tubes, 1,334
square feet; fire-box, 122 square feet; total, 1,456 square feet.
The weight in working order is on the pony truck, 8 tons 10 cwt.; leading
coupled, 12 tons 8 cwt.; driving coupled, 13 tons 5 cwt.; trailing
coupled, 12 tons 15 cwt.; total, 47 tons.
The tender weighs 28 tons in full working order.
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