Potomac Yard tests were conducted with cars obtained from the yard which were hard rollers. The rolling resistance of the car as received in the yard was compared with that after certain changes were made for improvement. A total of 408 test runs were made, utilizing 7 freight cars. Observations made during the testing were skewed trucks on tangent track; dragging brakes; wind up to 12 mph; poor center plates; comby wheels; hollow wheel treads; wheel diameter difference of 3/8 in.; and side bearing clearance from tight to 1/2 in. Changes made intended to improve rolling resistance were: grease outer rail on curves; apply regular grease on center plate; moly grease on center plate; add liners for side bearing clearance; grease side bearings; add nylon moly content liners in center plate; add brass liners in center plate; and tighten brake rods for rod eccentricity. Significant differences in the average rolling resistance were reported following the changes.

  • Corporate Authors:

    American Railway Engineering Association

    59 East Van Buren Street
    Chicago, IL  United States  60605
  • Publication Date: 1961

Media Info

  • Features: Tables;
  • Pagination: p. 799-802
  • Serial:
    • Volume: 62
    • Publisher: American Railway Engineering Association

Subject/Index Terms

Filing Info

  • Accession Number: 00037680
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 8 1994 12:00AM