NDLI: Understanding the benefits of long travel constant contact side bearings

Content Provider	IEEE Xplore Digital Library
Author	Iler, D.
Copyright Year	2006
Description	Author affiliation: Transp. Technol. Center Inc., Pueblo, CO, USA (Iler, D.)
Abstract	In 2001, a comprehensive test program was conducted under the AAR strategic research initiatives program by the Transportation Technology Center, Inc. (TTCI), Pueblo, Colorado, to determine the best types of constant contact side bearings (CCSBs) for use in 10 different North American freight cars. Test results indicated that long travel (LT) CCSB designs generally provided the best overall performance, which lead to an industry wide rule change. By using LT-CCSB, rail operations can be improved by maintaining better vertical wheel loads, providing high-speed stability, and providing more predictable truck turning forces. With a better understanding of both CCSB performance and the needs of the rail industry, an updated specification M-948 (AAR's Manual of Standards and Recommended Practices) was researched and revised in 2005. This paper documents the evolution of LT-CCSB research and the industry's implementation efforts since testing began in 2001. The testing and modeling that was performed in 2001 concentrated on car types that had a history of unpredictable performance. Well-maintained cars were selected to highlight the characteristics of long, short, tall, and torsional stiffness that each plays a part in the vehicles ability to reliably negotiate the railroad. Of the 10 cars, four were both track tested and modeled and the balance were only modeled. In almost every case, the railcars had a demonstrable performance improvement with the simple application of LT-CCSBs. The AAR quickly reacted by requiring all new cars and cars meeting certain conditions to have LT-CCSB (Rule 88). Following this test program two other independent tests were conducted, which demonstrated the advantages of LT-CCSBs. The first was a rail service test of two diesel tank cars and the second was a series of controlled tests on a tank car that had derailed at high speed. In both cases performance was markedly improved by the application of LT-CCSB. Finally the industry needed to update the side bearing specification M-948, in order to reliably control the performance of LT-CCSBs and preserve the benefit derived from their use. In preparation, a 2-year rail service test was conducted on three different cars, which were a refrigerated orange juice boxcar (operated in high speed intermodal or "Ztrain" service), an intermodal car, and a coal gondola. Using the data from these cars and knowledge from participants in the CCSB supply industry, the M-948 specification was revised to represent and preserve the operational benefits derived from CCSBs. This paper also documented an audit of the specification to highlight advantages from the revised M-948 specification.
Sponsorship	Rail Transportation Division, ASME
Starting Page	7
Ending Page	17
File Size	9526972
Page Count	11
File Format	PDF
ISBN	0791842037
DOI	10.1109/RRCON.2006.215287
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-04-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	ASME
Subject Keyword	Testing Rails Research initiatives Road transportation Wheels Stability Turning Performance evaluation History Vehicles rail service testing Constant contact side bearings (CCSB) long travel (LT) freight cars
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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