These engines take 40
loaded coal trucks or sixty empty ones, and burn 52 lb. of coal per train
mile, the worst gradient being 1 in 176. A notice of goods engines would
not be complete without alluding to a steep gradient locomotive, and a
good example is the engine which works the Redheugh Bank on the
North-Eastern Railway. This incline is 1,040 yards long, and rises for 570
yards 1 in 33, then for 260 yards 1 in 21.7, for 200 yards 1 in 25, and
finally for 110 yards 1 in 27. The engine, which is an all-coupled six
wheel tank engine, weighs 481/2 tons in working order, it has cylinders 18
in. diameter and 24 in. stroke, and 4 ft. wheels, the boiler pressure is
160 lb., and the tractive force per lb. of mean steam pressure in the
cylinders is 162 lb. This engine will take up the incline twenty-six coal
wagons, or a gross load of 218 tons, which is a very good duty indeed.
Having now passed in review the general types of engines adopted in modern
English practice, the author would briefly draw attention to some points
of design and some improvements effected in late years. And first, as to
the question of single or coupled engines, there is a great diversity of
opinion.
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