Other formats

    TEI XML file   ePub eBook file  

Connect

    mail icontwitter iconBlogspot iconrss icon

The New Zealand Railways Magazine, Volume 3, Issue 10 (May 1, 1929.)

Comparison With Other Types

Comparison With Other Types.

The following schedule shows the main dimensions and capacities of the new locomotive in comparison with our “Ab,” “Ww” and “X” classes:—

“Garratt.“—Length, over buffers 85ft., wheel-base 77ft., cylinders, 16 1/2in. diam. × 24in. stroke (6); diam. driving wheels, 4ft. 9in.; boiler pressure 2001bs.; boiler barrel diam., 6ft. 6in.; superheater flues, 43 flues, 5 1/4in. diam.; boiler tubes, 224 tubes, 1 3/4in. diam.; coal capacity, 6 tons; water capacity, 4000gals.; grate area, 58 sq. ft.; total heating surface, 2,765 sq. ft.; tractive power, 51,5801bs.; weight in working trim, 146 tons.

“Ab.“—Length, over buffers 62ft., wheelbase 52ft.; cylinders, 17in. diam. × 26in. stroke (2); diam. driving wheels, 4ft. 6in.; boiler pressure, 1801bs.; boiler barrel diam., 4ft. 8in.; superheater flues, 12 flues, 5 1/2in. diam.; boiler tubes, 110 average 1 3/4in. diam.; coal capacity, 4 1/2 tons; water capacity, 3,500gals.; grate area, 33 sq. ft.; total page 52 heating surface, 1,700 sq. ft.; tractive power, 20,000lbs.; weight in working trim, 85 tons.

“X.“—Length, over buffers 57ft, wheelbase 49ft.; cylinders, 13 1/2in. diam. × 22in. stroke (2), 22in. diam. × 22in. stroke (2); diam. driving wheels, 3ft. 9in.; boiler pressure, 230lbs.; boiler barrel diam., 4ft. 8in.; superheater flues, —; boiler tubes, 250 average 1 3/4in. diam.; coal capacity, 4 tons; water capacity, 2,200 gals.; grate area, 37 sq. ft.; total heating surface, 2,066 sq. ft.; tractive power, 26,620lbs.; weight in working trim, 94 tons.

Note.—The proportions of levers of Gresley Combining Gear as shewn on sketch, are not to scale; the short lever has equal arms, i.e., AB equals BC; the long lever is in the ratio of 2 to 1, i.e., De equals twice Bd. Illustration No. 1.

Note.—The proportions of levers of Gresley Combining Gear as shewn on sketch, are not to scale; the short lever has equal arms, i.e., AB equals BC; the long lever is in the ratio of 2 to 1, i.e., De equals twice Bd. Illustration No. 1.

“Ww.“—Length, over buffers 37ft., wheelbase 30ft.; cylinders, 15 1/2in. diam. × 22in. stroke (2); diam. driving wheels, 3ft. 9in.; boiler pressure, 180lbs.; boiler barrel diam., 3ft. 11in.; superheater flues, 10 flues 5 1/4in. diam.; boiler tubes, 70 average 1 3/4in. diam.; coal capacity, 2 tons; water capacity, 1,370gals.; grate area, 17 sq. ft.; total heating surface, 788 sq. ft.; tractive power, 16,900lbs.; weight in working trim, 52 tons.

In the Garratt locomotives are incorporated several fittings new to New Zealand railway practice, the principal of these being described as follows:—