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FINAL REPORT TCRP Project D-14 [Report 155] - Track Design Handbook for Light Rail Transit 2 nd Edition

FINAL REPORT TCRP Project D-14 [Report 155] - Track Design Handbook for Light Rail Transit 2 nd Edition . Prepared by: Lawrence G. Lovejoy, P.E. . TCRP Report 57. Updating Required Over a decade since original publication Doesn’t reflect other TCRP research since then

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FINAL REPORT TCRP Project D-14 [Report 155] - Track Design Handbook for Light Rail Transit 2 nd Edition

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  1. FINAL REPORT TCRP Project D-14 [Report 155]- Track Design Handbook for Light Rail Transit2nd Edition Prepared by: Lawrence G. Lovejoy, P.E.

  2. TCRP Report 57 Updating Required • Over a decade since original publication • Doesn’t reflect other TCRP research since then • Streetcar issues not covered • Construction & Maintenance not covered in a comprehensive way.

  3. The D-14 Project Research Team Parsons Brinckerhoff Wilson Ihrig & Associates Metro Tech Consulting Track Guy Consultants

  4. Report 57

  5. Changes From Report 57 • Chapter 1 – GENERAL INTRODUCTION • Increased focus on who the Handbook user is • and how he/she fits within an LRT project. • Expansion of the definition of what LRT is. • Chapter 2 – LIGHT RAIL TRANSIT VEHICLES • Updated discussions about characteristics of • contemporary LRVs and Streetcars • Added and in-depth discussion of how to select an appropriate wheel profile.

  6. Changes From Report 57 • Chapter 3 – LRT TRACK GEOMETRY • New discussion provided explaining the • relationships between lateral acceleration, • unbalance and the jerk rate • Expanded discussion concerning track crosslevel • and limitations on twist in tangent track. • Expanded discussion of alignment of freight • tracks and shared LRT/Freight tracks. • New article on issues where LRT shares a • corridor (but not tracks) with a freight carrier

  7. Changes From Report 57 • Chapter 4 – TRACK STRUCTURE DESIGN • The entire discussion about Nytram plots, • Filkins-Wharton diagrams and related issues • restructured to introduce basic concepts and • background information first and only then • develop the explanation of the methodology. • Discussions about restraining rails and their • application has been greatly restructured and • expanded with reference to TCRP D-7 project.

  8. Changes From Report 57 • Chapter 5 – TRACK COMPONENTS & MATERIALS • Tee rail discussion revised. • Groove rail discussion completely rewritten. • Restraining rail discussion completely rewritten. • Rail Fastener / Rail Fastening discussion • relocated and rewritten • Crosstie discussion largely rewritten

  9. Changes From Report 57 • Chapter 6 – SPECIAL TRACKWORK • Expanded discussion on types of frogs including • flangebearing and jump frog designs. • Revised/expanded discussion on selection of • turnout size. • Revised and expanded discussion on switches, • including those for embedded track.

  10. Changes From Report 57 • Chapter 7 – STRUCTURES & BRIDGES • Rewrote discussions of various types of • LRT structures and how they work. • Entirely new discussion on structures • carrying embedded track. • Entirely new discussion on open deck • structures and retrofitting existing • highway bridges to carry LRT track.

  11. Changes From Report 57 • Chapter 8 – CORROSION CONTROL • Miscellaneous revisions emphasizing inter- • disciplinary coordination issues. • Chapter 9 NOISE & VIBRATION CONTROL • Greatly expanded with extensive text revisions addressing salient issues including wheel/rail contact mechanics. Extensive new graphics • .

  12. Changes From Report 57 • Chapter 10 – TRANSIT SIGNAL WORK • New text on embedded switch machines. • Expanded text on rail bonding for signal and • power current, including reference to TCRP • D-7 work • Chapter 11 – TRANSIT TRACTION POWER • Expanded discussion on how track alignment • affects OCS design. • .

  13. New Chapters for 2nd Edition • Chapter 12 – LRT TRACK IN MIXED TRAFFIC • Entirely new chapter with emphasis on track • alignment for streetcar style operations. • Chapter 13 – LRT TRACK CONSTRUCTION • Entirely new chapter with emphasis on how • LRT tracks of all types are actually built. • Chapter 14 – LRT TRACK MAINTENANCE • Entirely new chapter with emphasis on how • LRT track maintenance is typically organized • and how it can be directly affected by • design decisions. • .

  14. Changes From Report 57 • Reversed Metric vs. US Traditional Measurement Units • Report 57 was prepared under the old Metrification • Policy. • Second Edition reverses the priority of SI vs. US • Traditional units of measurement • US units now first, with SI units [in brackets] • EXCEPTION: • When the dimension being discussed is metric in • origin (principally for manufactured products) the • SI units are listed first followed by a soft • translation to US Traditional Units.

  15. Challenges that Remain #1: How can we keep the Track Design Handbook for Light Rail Transit up-to-date?

  16. For questions concerning this presentation or for further information / assistance contact:Lawrence G. Lovejoy, P.E. Senior Supervising Engineer / Professional AssociateParsons Brinckerhoff Four Gateway Center, Suite 1305Pittsburgh, PA  15222-1220USADirect line: 1-412-644-3050 Cel phone: 1-412-580-1414 e-mail:  lovejoy@pbworld.comhttp://www.pbworld.com/

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