IMPACT TESTS CONDUCTED ON: A. HULSON HIGH CAPACITY CUSHION UNDERFRAME B. ALL AAR APPROVED FRICTION DRAFT GEARS AND C. ALL AAR FREIGHT RUBBER DRAFT GEARS

The purpose of these tests was to evaluate the various cushioning means available for protecting freight cars against longitudinal forces of impact. All gears were new and taken from stock except one rubber type and one friction type, both of which were shipped direct from the manufacturers. The outstanding performer in this series of tests was that of the Hulson High-Capacity Cushion Underframe. Studies of the detail test records show the average of friction draft gear closure was at a coupling speed of 3.9 mph and all gears were closed at 5 mph when used in fully loaded cars. No closing point was found for the freight rubber draft gears. They continued to operate during the entire range of coupling speeds. It is to be noted that these are the results for new gears and might properly be followed with similar tests on gears that have been in service over a period of years.

• Corporate Authors:

  Union Pacific Railroad

  Mechanical Department
  Omaha, NE  United States  68102
• Publication Date: 1952-5-22

Media Info

• Features: Appendices; Figures; Photos;
• Pagination: 38 p.

Subject/Index Terms

• TRT Terms: Couplers; Crashes; Cushioning materials; Deceleration; Equipment tests; Freight cars; Gears; Gondola cars; Railroad cars; Shock (Mechanics); Stresses; Technology; Train track dynamics; Vehicle dynamics; Velocity
• Uncontrolled Terms: Contact stress; Draft gears
• Geographic Terms: United States
• Old TRIS Terms: Car impact; Cushioning; Shock deceleration; Test equipment
• Subject Areas: Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00039971
• Record Type: Publication
• Report/Paper Numbers: Tech Rpt
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM