Locomotive AT&SF 940 latter 987

Transcribed from Railway Age of May 30. 1902

Page 1

In articles previously published, the development of the motiver power of the Atchison Topeka & Santa Fe to is present state of efficiency has been traced. Both freight and passenger locomotives of the most modern type have been added to the equipment during the past year, the most prominent of these being two heavy decapods to be used in freight service on the mountain division. These were built by the American Locomotive Company and illustrated in the Railway Age of January 31, 1902. At that time these locomotives were considered the most powerful machines ever built, both in point of weight and tractive power. We now have to record the completion of an engine, built by eth Baldwin Locomotive Works and designed for the same service, that exceeds these locomotives by 2,300 pounds in tractive power and 6,000 pounds in total weight. The accompanying illustration are presented through the courtesy of the builders and the management of the road.

SIDE ELEVATION AND CROSS SECTION OF SANTA FE DECAPOD. (clic on image for larger image 265K)

These engines are similiar in appearance to the locomotives previously built, being equiped with tandem compound cylinders, but differ materially in the design employed in most of the vital parts of the locomotive, prinicipal among which mention may be made of the changes in cylinder constructioon and valve motion. The construction and arrangement of the various parts involved in this design is of primary importance and these are therfore presented in considerable detail. Much thought has been given to simplifying the design of the several different parts of the cylinder arrangement, with a view of reducing to a minimum the difficulties encountered in making repairs.

BALDWIN TANDEM-COMPOUND DECAPOD FOR THE ATCHISON TOPEKA & SANTA FE.

Referring to the illustrations it will be noted that the cylinders are cast separately from the saddle, and the frame is made a broad slab where the saddle and cylinders are bolted together by twenty-six 1-1/2 inch bolts passing through the outer walls of the saddle casting and suitable flanges cast on the cylinders. The frame at this point has lugs formed vertically on the slab, both front and back. The cylinders and saddle have the forward face of their connecting flanges butted solidly against the forward lugs, provision being made at the rear to draw them to place by the use of a pairs of taper keys driven vertically, one from the upper and one from the lower side of the frame, having their tapered faces in contact. These are held in place by three bolts passing through the keys on the line of their intersection, the holes being drilled after the keys are in place.

END VIEW AND CROSS SECTION OF BOILER

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