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/ SAFETY DEVICES FOR TRACK LAID ON CONCRETE OR STEEL SLEEPERS. ELECTRICAL PROPERTIES OF A TRACK LAID ON WOODEN SLEEPERS AND PRACTICAL DETERMINATION OF ITS ESSENTIAL CHARACTERISTIC DATA https://trid.trb.org/View/15057 Fri, 08 Jul 1994 00:00:00 GMT https://trid.trb.org/View/15057 SAFETY DEVICES FOR TRACK LAID ON CONCRETE ON STEEL SLEEPERS. THE ELECTRICAL INSULATION OF RAILS ON CONCRETE SLEEPERS https://trid.trb.org/View/15058 Fri, 08 Jul 1994 00:00:00 GMT https://trid.trb.org/View/15058 SAFETY DEVICES FOR TRACK LAID ON CONCRETE OR STEEL SLEEPERS. SUMMARY OF THE STUDIES OF THE COMMITTEE https://trid.trb.org/View/15059 Fri, 08 Jul 1994 00:00:00 GMT https://trid.trb.org/View/15059