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Shared Use of Railroad Infrastructure with Noncompliant Public Transit Rail Vehicles: A Practitioner's Guide (2009) / Chapter Skim
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Appendix 2 - Glossary of Shared-Track Definitions
Pages 88-92

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From page 88...
... Commingled Operations Commingling between light transit and conventional vehicles implies that trains operating over a shared-track segment are separated from one another on purely track warrants, signal indications, automated train control systems, or other such like train signaling systems. FRA stipulations require a system that ensures "fail-safe train separation" between light transit and conventional railroad trains.
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From page 89...
... Crash Energy Management (CEM) A method structural design that controls structural crush by analyzing the dynamic crush behavior of the vehicle, relating it to passenger safety incorporating features into the railcar structure to absorb and dissipate collision energy in a manageable and predictable fashion to minimize injury to passengers and crews.
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From page 90...
... Haulage Rights A "guest" railroad has haulage rights over another if it has the legal authority to require the host railroad to transport the guest's traffic over the host's lines, using any means deemed appropriate by the host railroad. Light Passenger Rail Cars Light rail passenger vehicles, a generic term applied to all passenger vehicles that do not comply with 49 CFR Part 238 Subpart C Specific Requirements for Tier I Passenger Equipment.
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From page 91...
... A CTC installation is not necessary for an OCC, but an OCC is a prerequisite for a CTC installation. Scripted Temporal Separation Light transit operations are under scripted temporal separation if there is a script governing the transfer process, allowing more operationally complex modes of sharing the segments of the shared-track system.
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From page 92...
... For temporally separated operations in the United States, the shared track enters freight mode when all light rail operations have ceased, the shared-track is verified as vacant by the dispatcher, and a predefined transfer procedure is carried out to change operations to freight mode. 92 Shared Use of Railroad Infrastructure with Noncompliant Public Transit Rail Vehicles: A Practitioner's Guide
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Key Terms

  • light transit
  • temporal separation
  • rolling stock
  • control center
  • conventional railroad

  • multiple unit
  • traffic control
  • transit operations
  • scripted temporal
  • corridor operations

  • legal authority
  • nighttime joint
  • railroad trains
  • shared corridor
  • federal register

  • buff strength
  • track occupancy
  • public transit
  • standard operating
  • equipment including

  • diesel multiple
  • noncompliant public
  • joint operation
  • operating procedure
  • rail line

  • railroad infrastructure
  • transit rail
  • centralized traffic
  • passenger vehicles
  • including freight


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