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This engine was designed by Mr. F. W. Johnstone Supt. of Motive
Power and Machinery of the Mexican Central Ry. in 1892.
The two boilers of the engine are carried in a long rigid frame
and the fire doors are in the sides; the water supply is carried
in saddle tanks and the front trucks are of the two wheeled
radial type pivoted to the main frame.
The dimensions are as follows; cylinders 13" and 28"
by 24" stroke; driving wheels 40" dia; total wheel
base 45 feet 11 inches, weight on driving wheels 200,000 lbs;
total weight of engine 230,000 lbs.
The engine was designed for work on long grades of 160 feet per
mile, with 18 to 22 degree curves and was of novel design and
great power.
On account of the great amount of curvature, heavy consolidation
or decapod engines, could not be used to advantage and it was
necessary to obtain a heavy powerful engine with a very flexible
wheel base and the design shown herewith was the result.
The cylinders are annular, the high pressure being inside the
low and each combined cylinder is equal to a single expansion
cylinder of 19" dia. This engine was designed to haul
freight trains between Tampico and Mexico.
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