Twelve field test runs were performed to measure friction snubber forces using a device developed by Wyle Laboratories, Colorado Springs. Reel 6 contains test runs 011 and 012. Four devices were installed on a Type I truck (the ASF Ride Control) which was placed under the B-end of a loaded open hopper car. Forty-eight channels of data were acquired on friction snubber force, car speed, automatic location detection, acceleration, and displacement at critical points on the truck and carbody. The first test run was made over branchline class 2 track on the Blue Diamond Spur near Las Vegas, Nevada. The test zone included both tangent and curved jointed rail with an uphill grade of approximately 1.8%. The test run starts at 20 mph at milepost 5 and continues until milepost 7, where the speed starts decreasing down to 2 mph at the end of the test at milepost 8.2. The second test run was made over mainline class 4 track with a downhill grade of approximately 0.8%. The test run starts at 50 mph at milepost 322 and continues until milepost 324.5, where the speed starts decreasing down to 5 mph at the end of the test at milepost 326.8. The significant test parameters associated with these two tests are: Car Type -100-ton open hopper; Car Orientation - B-end forward; Car Tare Weight - 57,900 pounds; Tare Weight 201,500 pounds; Type of Lading - gravel; Truck Center - 36 feet, 2 inches; No. of Loco's - 1; No. of Cars Fore - 2; No. of Cars Aft - 2; Truck Type - ASF Ride Control 70-ton; Wheel Base - 68 inches; Springs Group Out - 7 D5; Spring Group In - 6 D5; Center Plate Diameter - 14 inches; Center Plate Lub - Moly Disulfied; Side Bear B-End -Stucki double; Side Bear Clear - 0.25 inches; Snubber Type - constant; Snubber Springs - 2 ASF 3020.

  • Supplemental Notes:
    • See also PB81-122806. Also available in set of 6 tapes PC T07, PB81-122822. Source tape is in ASCII and BINARY character sets. Character set restricts preparation to 9 track, one-half inch tape only. Identify recording mode by specifying density only. Call NTIS Computer Products if you have questions. Price includes documentation, PB80-129596.
  • Corporate Authors:

    Federal Railroad Administration

    Office of Research and Development, 1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Bakken, G B
    • Bates, E
    • GIBSON, D W
  • Publication Date: 1979-10

Media Info

  • Pagination: n.p.

Subject/Index Terms

Filing Info

  • Accession Number: 00328309
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: FRA/ORD/MT-80/72/6, FRA/DF-80/006
  • Files: NTIS, TRIS, USDOT
  • Created Date: Apr 15 1981 12:00AM