521 Series (J22) Saturated

A new type of six-coupled goods engines with standard wheels was brought out in 1909, and is illustrated in Fig. 116.

Following are the leading dimensions:-

• Cylinders 18-in. in diameter by 26-in. stroke; diameter of six-coupled wheels §-ft. 2-in.;
• wheelbase: leading to driving 7-ft. 3-in., driving to trailing 9-ft., total 16-ft. 3-in.;
• boiler: length of barrel 10-ft. 1-in., diameter (outside) +-ft. 8-in.; height of centre above rails 7-ft. 9g-in.; heating surface: firebox 120 sq. ft., tubes 1,130 sq. ft., total 1,250 sq. ft.; grate area 19 sq. ft.; working pressure 170 lb. per sq. in.;
• weight of engine in working order 47 tons 6 cwt., distributed as follows: on leading wheels 15 tons 14 cwt., on driving wheels 17 tons and on trailing wheels 14 tons 12 cwt.

The tender is of the new type, weighing +3 tons 2 cwt. Twenty engines of this class have been built so far, bearing the following numbers:-