Research in Progress (RIP) https://rip.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) Research in Progress (RIP) https://rip.trb.org/Images/PageHeader-wTitle-RIP.jpg https://rip.trb.org/ Quick-Response Research on Long-Term Strategic Issues. Task 55. Impact of Positive Train Control https://rip.trb.org/View/2636147 Mon, 08 Dec 2025 20:06:14 GMT https://rip.trb.org/View/2636147 International Workshop on High-Speed Rail Planning and Operations https://rip.trb.org/View/1372372 Wed, 21 Oct 2015 09:26:11 GMT https://rip.trb.org/View/1372372 Positive Train Control for Commuter Rail https://rip.trb.org/View/1258250 Mon, 05 Aug 2013 00:56:50 GMT https://rip.trb.org/View/1258250 Positive Train Control (PTC) for Commuter and Regional Rail Systems https://rip.trb.org/View/1233974 Thu, 03 Jan 2013 15:04:45 GMT https://rip.trb.org/View/1233974