Technology Digests / Turnout Inspection: Current Practices and Emerging Automated Technologies

TD26-006

May 21, 2026
Authors
  • Ekrem Koç
  • Yin Gao
  • Ryan Alishio
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Key Findings

  • ATOI technologies offer promising benefits, including more frequent monitoring and objective measurements without the necessity of replacing manual inspections entirely.
  • Survey responses among Class I railroad representatives reflect strong industry interest in adopting ATOI tools. However, concerns remain regarding the current capabilities of these systems.
  • Routine inspections do not always identify in-service turnout failure modes, which highlights the influence of operating and environmental conditions not always captured by scheduled inspection programs.
  • Federal Railroad Administration regulations provide the foundation for turnout inspections, but railroads often go beyond these requirements by applying stricter internal standards and more proactive maintenance strategies.

Turnout Inspection: Current Practices and Emerging Automated Technologies

As part of Association of American Railroads’ (AAR) Strategic Research Initiative (SRI) program, MxV Rail engineers have been researching turnout inspection methods and available technologies. This Technology Digest includes the documentation of current turnout inspection practices in North America and the new automated turnout inspection technologies available in the market. BACKGROUND Turnouts are among the most complex, yet essential, components of railroad infrastructure.1 The capacity of a rail line often depends on the number of turnouts and their strategic placement, which enables trains to switch tracks, access sidings, and enter yards. Turnouts are subjected to high dynamic loading due to their structural complexity and the presence of discontinuities along the running surface. As a result, turnouts require more specialized inspection and maintenance practices, compared to open tracks. Unlike open track, which typically consists of basic components such as rails, ties, fasteners, and ballast, a turnout contains some unique elements, including…