Rail Capacity Improvement Study for Commuter Operations

Abstract

This report describes principles and concepts related to capacity for commuter rail operations. It offers a combination of considerations and evaluation tools pertaining to relevant means of capacity improvements (technology, operations, route, and vehicle upgrades), both conventional and emerging. Guidance regarding minimizing cost of achieving the level of capacity improvement required is provided. Report topics include track and station configuration, rolling stock, train operations, and signal issues. Transportation Technology Center, Inc. (TTCI) identifies promising potential improvements and additions to infrastructure to increase capacity (emphasizing cost-effective technology solutions). Discussion is provided on investment planning to increase commuter rail system capacity by making the various improvements noted. The study also discusses the benefits, effectiveness, and life cycle costs of the various solutions. To illustrate these principles, TTCI has evaluated various aspects of the present capacity limitations versus ridership for a large commuter rail system in the United States to determine capacity constraints and to identify areas where improved capacity might be needed. Two sections present an overview and selected case studies of the Metrolink system operating in the Los Angeles regional area with analysis of various capacity issues. In each case study, different aspects of commuter rail capacity are examined. In some cases, suggestions are offered where improvements could be made that would increase system reliability.