Proceedings of the American Railway Engineering Association Volume 10, PT. 1

Proceedings of the American Railway Engineering Association Volume 10, PT. 1

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...L which gives the following values of--: E 1.15 1.20 1.30 1.40 V L--= 0.40 V 0.65 V 0.92 V 1.57 V 2.35 V E Hence there will be no discomfort from too rapid increase of centrifugal force or too rapid tipping of cars at any speed under 1.15 times the calculated speed if the length of spiral per inch elevation equals two-thirds of the calculated speed in miles per hour. L V Although the ratio of--to V increases rapidly when--exceeds LIS, E V it must be remembered that the point of discomfort is being approached if not overreached through another cause, i. e., insufficient elevation; V when--= 1.40 the maximum safe speed for 8 in. elevation has been V reached. It is worthy of note that the spirals in use on the Pittsburg & Lake Erie Railroad--and found to be the most satisfactory as a result of twenty years' experiment and experience--have approximately the same L ratio (--= 2/3 V) that the above theoretical examination would indi E cate as giving results entirely free from discomfort. While some discomfort may possibly be added to that already produced by excessive centrifugal force, by a too rapid increase in centrifugal force of a train moving at the maximum safe speed on a curve elevated 8 in. at a rate of runoff of L/E = 2/$V, the fact that the resulting rate of increase of unbalanced centrifugal force is much below that resulting from the standard of practice on the New York Central Lines, proves that L/E = 2/$V will give results within a wide margin of safety under the most adverse speed conditions. There is naturally some practical limit to the application of the ratio 2/3; for, while the calculated speed for a 20-degree curve with 8 in. elevation is 24.6 miles per hour, it would not be the best practice to increase the more

Product details

  • Paperback | 252 pages
  • 189 x 246 x 13mm | 458g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236592565
  • 9781236592569