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TCRP Report 130: Shared Use of Railroad Infrastructure with Noncompliant Public Transit Rail Vehicles: A Practitioner's Guide (2009)
Transit Cooperative Research Program (TCRP)

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Transportation Research Board. "Research Objective." TCRP Report 130: Shared Use of Railroad Infrastructure with Noncompliant Public Transit Rail Vehicles: A Practitioner's Guide. Washington, DC: The National Academies Press, 2009.

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Front Matter (R1-R12)
Research Objective (1-1)
Report Output (2-2)
Business Case (3-4)
Train Control Technology (5-5)
Grade Crossing Hazards (6-6)
Requirements for Concurrent Shared-Track Operations (7-7)
Practical Shortcuts (8-8)
Advancing the Shared-Track Concept (9-9)
Introduction (10-10)
Reader's Guide to the Final Report (11-11)
Scope of Work for Project A-27 (12-12)
Research Approach (13-13)
Characteristics of a Shared-Track Corridor (14-14)
Freight Operations Perspective (15-16)
Why Share Track? (17-17)
The Business Model (18-18)
Business Model Structure (19-19)
The Business Case (20-20)
Shared-Track - A Practical Business Case Structure (21-22)
Role of the Designated State Safety Organization (23-23)
Methods for Risk Analyses (24-24)
Equal Risks, Equivalent Safety (25-25)
Underpinning the Case for Shared-Track (26-26)
The Role of Command and Control Systems in Shared-Track (27-27)
1) Train Control System Functions (28-28)
2) Train Control System Design Parameters (29-29)
4) Train Control - Emerging Technology - PTC and CBTC (30-30)
System and Integration Testing - Vendor Role (31-31)
8) Issues Unique to Train Control for Shared-Track (32-32)
Auxiliary Safety Critical Systems (33-33)
9) Fail-Safe Train Separation (34-35)
2) Regulatory and Practical Requirements (36-37)
4) Functional Design of a Communications System (38-38)
2) Regulatory Mandates (39-39)
4) The Rulebook (40-40)
5) Rules and Procedures for Shared-Track (41-41)
Background (42-42)
2) Diesel Multiple Units and Electrical Multiple Units (43-43)
2) Crash Energy Management (CEM) (44-44)
3) Propulsion System (45-45)
5) Other Considerations (46-46)
Vehicles for Shared-Track Applications (47-47)
3) Standardization (48-48)
Applying Technology to Shared-Track Operations - A Brief Guide (49-50)
Shared-Track Operations - The North American Experience (51-51)
2) Former Private Freight Railroad Owner Becomes a Privileged Tenant (52-52)
4) Pressure to Commingle Is Heaviest on Lines with Higher Freight Densities* - A Review of Different Solutions (53-53)
6) Transit Operators Choosing to Avoid Commingling Sacrificed Service Quality and Efficiency (54-54)
Business Case Template (55-55)
Alternatives Analysis (56-56)
Reasons to Consider Noncompliant Equipment (57-57)
Service Characteristics to Justify the Choice of a Light Rail System (58-58)
Structures Considerations (59-59)
Cost and Ridership Analyses (60-60)
Cost Analysis for Signal System Alternatives (61-62)
System Capital Cost Assessment (63-63)
System Operating Cost Assessment (64-65)
Alternatives Evaluation (66-66)
Introduction (67-67)
Risk Analysis and Modeling Methodology (68-70)
Results and Risk Analysis Findings (71-72)
Safety Case Findings (73-73)
San Diego Trolley (74-74)
Achievable Incremental Steps (75-75)
Practical Shortcuts For Shared-Track (76-76)
Demonstration Project (77-77)
Application of Risk Analyses Methodology to the Demonstration Project (78-78)
Data Collection Plan (79-79)
San Diego Trolley, Inc. (80-80)
Barriers to Implementation (81-81)
Shared Track - The Potential Market (82-82)
Shared-Track Operation - An Evolving Concept (83-84)
Bibliography (85-86)
Appendix 1 - Abbreviations (87-87)
Appendix 2 - Glossary of Shared-Track Definitions (88-92)
Appendix 3 - TCRP A-27 Research Task Descriptions (93-97)
Appendix 4 - Relative Cost Comparison of Train Control Systems (98-99)
Appendix 5 - Sample Operating Rulebook Table of Contents (100-100)
Appendix 6 - Vehicle Cost Drivers (101-101)
Appendix 7 - Some Examples of Current Production LRV and MU Vehicle Types (102-105)
Appendix 8 - Shared-Track System Status (106-106)
Appendix 9 - Shared-Track Configuration and Operational Alternatives (107-109)
Abbreviations used without definitions in TRB publications (110-110)

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SUMMARY Shared Use of Railroad Infrastructure with Noncompliant Public Transit Rail Vehicles: A Practitioner's Guide Research Objective A. Over the past decade, highway and urban congestion have garnered the attention of com- muters as well as government entities. Facility joint-use, by expanding public transit using existing rail corridors, is one approach to solving the constellation of problems occurring as offshoots of congestion. Such routes are especially attractive because they appear to have available capacity and utilize an existing connection between high trip generating origins and destinations. The potential and feasibility of shared use of rail corridors, between light rail vehicles (associated with public transit) and freight railroads, to function compatibly are still being investigated, even as current "near shared-track" operations are evolving. B. A number of operating issues need to be addressed, including the relative safety of shared- track, and practicality of the operational concept. Other questions that remain to be answered include: · How to mitigate joint use risks? What accommodations are necessary to make com- mingled shared-track workable in a variety of situations? · What are the viable business models? · How would shared use affect a current freight carrier and the rail corridor operations? Can track sharing be made attractive to the freight operator? · What are its advantages to the public? · How do public agencies develop policies and strategies to enable the use of an existing freight track for public transit? · What are the capital, maintenance, and insurance costs elements? · Finally, the most significant unknown is determining what is necessary to satisfy the FRA to obtain approval for this mode of operation. C. The intent of the research project is to initiate a pragmatic investigation whose end product is a guidebook for transportation and other practitioners, and to assist them in finding answers to the questions raised above. Part of the goal is pedagogic: to pro- vide a means to expand knowledge and understanding of strategies to ensure safety in rail transportation. The information and analysis should form a basis for informed dis- cussion, analysis, and decisions in the environment of shared-track of infrastructure, including approaches to an assessment of benefits and costs; and demonstrate current practical processes and applications of different scopes. D. Valuable and cost-effective projects of opportunity are available in some of the larger urban and suburban areas in the United States. Consequently, a secondary goal is to for- malize and standardize an American approach to concurrent shared-track operations. 1