Transport Research International Documentation (TRID) https://trid.trb.org/ en-us Copyright © 2026. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Transport Research International Documentation (TRID) https://trid.trb.org/Images/PageHeader-wTitle.jpg https://trid.trb.org/ DEVELOPMENT OF HEAVY RAIL-PROFILES. STUDY OF A NEW 71 KG/M RAIL (ORE 71 PROFILE) https://trid.trb.org/View/14899 Fri, 14 May 1976 00:00:00 GMT https://trid.trb.org/View/14899 DEVELOPMENT OF HEAVY RAIL-PROFILES. GUIDING PRINCIPLES FOR THE DEVELOPMENT OF HEAVY RAIL-PROLIES https://trid.trb.org/View/15128 Fri, 14 May 1976 00:00:00 GMT https://trid.trb.org/View/15128