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Alaska Department of T Ransportation & Public Facilities Evaluation Of Alaska Department of Transportation & Public Facilities Transportation Alaska Department of Evaluation of Track Circuits Through Whittier Tunnel Prepared By: Bill Wiedmann Bert Wescott April 2013 Prepared For: Alaska Department of Transportation & Public Facilities Research, Development, and Technology Transfer 2301 Peger Road Fairbanks, AK 99709-5399 FHWA-AK-RD-13-12 DISCLAIMER Notice This document is disseminated under the sponsorship of the U.S. Department of Transportation in the interest of information exchange. The U.S. Government assumes no liability for the use of the information contained in this document. The U.S. Government does not endorse products or manufacturers. Trademarks or manufacturers’ names appear in this report only because they are considered essential to the objective of the document. Quality Assurance Statement The Federal Highway Administration (FHWA) provides high-quality information to serve Government, industry, and the public in a manner that promotes public understanding. Standards and policies are used to ensure and maximize the quality, objectivity, utility, and integrity of its information. FHWA periodically reviews quality issues and adjusts its programs and processes to ensure continuous quality improvement. Author’s Disclaimer Opinions and conclusions expressed or implied in the report are those of the author. They are not necessarily those of the Alaska DOT&PF or funding agencies. Form approved OMB No. REPORT DOCUMENTATION PAGE Public reporting for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestion for reducing this burden to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-1833), Washington, DC 20503 1. AGENCY USE ONLY (LEAVE BLANK) 2. REPORT DATE 3. REPORT TYPE AND DATES COVERED FHWA-AK-RD-13-12 April 2013 FINAL 09/2012 to 04/2013 4. TITLE AND SUBTITLE 5. FUNDING NUMBERS Evaluation of Track Circuits Through Whittier Tunnel AKSAS #61862/T2-12-07 Federal # RI-4000(116) 6. AUTHOR(S) Bill Wiedmann, Bert Wescott 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER The Burns Group Engineering and Construction 1835 Market Street FHWA-AK-RD-13-12 Philadelphia, PA 19103 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING AGENCY REPORT NUMBER Alaska Department of Transportation and Public Facilities Research, Development &Technology Transfer FHWA-AK-RD-13-12 2301 Peger Rd Fairbanks, AK 99709-5399 11. SUPPLEMENTARY NOTES 12a. DISTRIBUTION / AVAILABILITY STATEMENT 12b. DISTRIBUTION CODE No restrictions. 13. ABSTRACT (Maximum 200 words) The Alaska Department of Transportation and Public Facilities (Alaska DOT&PF) in cooperation with the Alaska Railroad (AKRR) is seeking viable mitigation strategies for the progressive failure of the track circuits traversing the Anton Anderson Memorial Tunnel, better known as the Whittier Tunnel. This report documents our findings and proposed mitigation measures and includes: • Narrative on the field evaluation of the existing track bed and track circuit systems used to determine the causes for the track circuit failures, • Alternative solutions for modifying the existing track circuit system including, but not limited to modifying the rail bed, and/or using axle counters, • Budgetary cost estimates for the alternatives developed. 15. NUMBER OF PAGES 14. KEYWORDS : Tunnels (Pdvt), Automatic train location (Dmbyc), Track panels (Pmudbv), Automatic train control (Dcmvgyf) 16. PRICE CODE N/A 17. SECURITY CLASSIFICATION OF 18. SECURITY CLASSIFICATION 19. SECURITY CLASSIFICATION 20. LIMITATION OF ABSTRACT REPORT OF THIS PAGE OF ABSTRACT Unclassified Unclassified Unclassified N/A NSN 7540-01-280-5500 STANDARD FORM 298 (Rev. 2-98) Prescribed by ANSI Std. 239-18 298-102 SI* (MODERN METRIC) CONVERSION FACTORS APPROXIMATE CONVERSIONS TO SI UNITS Symbol When You Know Multiply By To Find Symbol LENGTH in inches 25.4 millimeters mm ft feet 0.305 meters m yd yards 0.914 meters m mi miles 1.61 kilometers km AREA in2 square inches 645.2 square millimeters mm2 ft2 square feet 0.093 square meters m2 yd2 square yard 0.836 square meters m2 ac acres 0.405 hectares ha mi2 square miles 2.59 square kilometers km2 VOLUME fl oz fluid ounces 29.57 milliliters mL gal gallons 3.785 liters L ft3 cubic feet 0.028 cubic meters m3 yd3 cubic yards 0.765 cubic meters m3 NOTE: volumes greater than 1000 L shall be shown in m3 MASS oz ounces 28.35 grams g lb pounds 0.454 kilograms kg T short tons (2000 lb) 0.907 megagrams (or "metric ton") Mg (or "t") TEMPERATURE (exact degrees) oF Fahrenheit 5 (F-32)/9 Celsius oC or (F-32)/1.8 ILLUMINATION fc foot-candles 10.76 lux lx fl foot-Lamberts 3.426 candela/m2 cd/m2 FORCE and PRESSURE or STRESS lbf poundforce 4.45 newtons N lbf/in2 poundforce per square inch 6.89 kilopascals kPa APPROXIMATE CONVERSIONS FROM SI UNITS Symbol When You Know Multiply By To Find Symbol LENGTH mm millimeters 0.039 inches in m meters 3.28 feet ft m meters 1.09 yards yd km kilometers 0.621 miles mi AREA mm2 square millimeters 0.0016 square inches in2 m2 square meters 10.764 square feet ft2 m2 square meters 1.195 square yards yd2 ha hectares 2.47 acres ac km2 square kilometers 0.386 square miles mi2 VOLUME mL milliliters 0.034 fluid ounces fl oz L liters 0.264 gallons gal m3 cubic meters 35.314 cubic feet ft3 m3 cubic meters 1.307 cubic yards yd3 MASS g grams 0.035 ounces oz kg kilograms 2.202 pounds lb Mg (or "t") megagrams (or "metric ton") 1.103 short tons (2000 lb) T TEMPERATURE (exact degrees) oC Celsius 1.8C+32 Fahrenheit oF ILLUMINATION lx lux 0.0929 foot-candles fc cd/m2 candela/m2 0.2919 foot-Lamberts fl FORCE and PRESSURE or STRESS N newtons 0.225 poundforce lbf kPa kilopascals 0.145 poundforce per square inch lbf/in2 *SI is the symbol for the International System of Units. Appropriate rounding should be made to comply with Section 4 of ASTM E380. (Revised March 2003) Evaluation of Track Circuits Through Whittier Tunnel Contents Overview .......................................................................................................................................................... 4 Purpose ........................................................................................................................................................ 4 Historical ...................................................................................................................................................... 4 Construction ................................................................................................................................................. 5 Tunnel Operation ......................................................................................................................................... 6 Tunnel Signal System (TSS) .......................................................................................................................... 7 The Problem ..................................................................................................................................................... 9 Track Circuit ............................................................................................................................................... 10 Ballast Resistance ....................................................................................................................................... 11 Shunting ..................................................................................................................................................... 14 Broken Rail Protection ............................................................................................................................... 14 Condition of Tunnel Roadway and Rail ........................................................................................................ 15 Summary of rail observations .................................................................................................................... 15 Summary of panel observations ................................................................................................................ 15 Cracks ......................................................................................................................................................... 15 Surface Deterioration................................................................................................................................. 16 Joints .......................................................................................................................................................... 17 Settled panels................................................................................................................................................. 18 Rubber Rail Seal ......................................................................................................................................... 18 Pandrol® Clips and Other Track Material (OTM) ......................................................................................
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