The result of this study of 2,161 hot boxes' data indicates that hot boxes occur less frequency on spring plankless trucks. However the cars with spring plankless trucks are newer cars, a fact which should be given weight in any conclusions reached. The ratio of ownership of spring plank trucks to spring plankless trucks is 2,48 to 1.0 but the ratio of hot boxes on spring plank trucks to spring plankless trucks is 3.45 to 1.0. It was concluded that the major causes of hot boxes (71.16%) are derived from the conventional waste pack. Elimination of this waste pack by substituting an improved method or material to provide the lubrication would eliminate many hot boxes. Periodic repacking, and the associated attention to the box assembly at that time does not reduce the frequency of hot boxes during the immediately following months, as might be expected. The higher capacity cars run hot less frequently than the lower capacity cars, but the higher capacity cars are generally more modern. The number of hot boxes caused by bearing defects indicates need for improvement of bearing design and box assembly. Tank and refreigerator car performance is less satisfactory than the average of all other types.

Media Info

  • Pagination: 2 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00040357
  • Record Type: Publication
  • Report/Paper Numbers: AAR MR-210 Res Rpt
  • Files: TRIS
  • Created Date: Jul 8 1994 12:00AM