CBTC Signal Engineer

THIS OPPORTUNITY

WSP is currently initiating a search for a CBTC Signal Engineer to join our Transit and Rail/Systems Engineering in our Seattle, WA Office
.

The CBTC Signal Engineer provides specialized technical support and oversight of both CBTC and fixed-block signaling systems for the program. This position ensures that signal designs, interlocking logic, and mixed-mode block configurations are reviewed, validated, and approved in compliance with operational principles and safety standards.

The ideal candidate possesses a deep understanding of both traditional relay-based signaling and CBTC software-based interlocking logic, with hands‑on experience supporting Sound Transit projects. This role serves as a vital liaison between the supplier, designer, and the agency to facilitate design acceptance, support test readiness, and ensure system safety and operational continuity throughout the migration to CBTC.

• Provide technical review and approval of block design drawings and documentation for mixed‑mode (CBTC and fixed‑block) operation.
• Serve as the primary liaison between the CBTC supplier, designer, and agency operations for all matters related to signal design coordination and block approval.
• Review and assess interlocking logic implementation within both the relay‑based fixed‑block design and CBTC subsystem software, ensuring operational and safety compliance.
• Review and approve test procedures related to interlocking logic, signal aspects, and control sequences to confirm compliance with authority requirements.
• Evaluate software state machine logic used to implement interlocking functions in CBTC subsystems and ensure proper alignment with agency signaling principles and operational rules.
• Provide assurance that signal design changes maintain interoperability, safety integrity, and system maintainability during migration from fixed‑block to CBTC control.
• Support interface alignment between CBTC zone controller logic, relay interlockings, and field signal equipment.
• Participate in design and field review meetings with Engineering, Operations Planning, and Maintenance teams to address design, testing, and configuration issues.
• Track and report on signal design deliverables, test progress, and open design comments requiring agency review or resolution.
• Perform additional responsibilities as required to support the successful integration, validation, and acceptance of the CBTC and fixed‑block signaling systems.

• Bachelor’s degree in electrical, systems, or railway engineering; a minimum of 7 years of progressive experience in fixed‑block and CBTC signaling system maintenance and/or design may be considered in lieu of a degree.
• Proven record of reviewing, approving, and coordinating block design packages for mixed‑mode signaling operation.
• Experience developing or reviewing interlocking logic test procedures and software state machine implementations.
• Strong understanding of signal principles, operational practices, and legacy control systems.
• Prior involvement in at least one major CBTC deployment or migration project.
• Ability to work during off‑hour testing or commissioning as needed.
• Ability to support field reviews, test witnessing, and agency coordination meetings.
• Flexibility to perform additional responsibilities as assigned to ensure program success.
• Full understanding of vital and non‑vital signal logic, relay‑based control circuits, and their translation into CBTC subsystem software.
• Working knowledge of interlocking design, block layouts, overlap logic, and control line functions.
• Understanding of test sequencing, verification, and validation of signaling systems within mixed‑mode operation.
• Technical Knowledge:
  • Full understanding of vital and non‑vital signal logic, relay‑based control circuits, and their translation into CBTC subsystem software.
  • Working knowledge of interlocking design, block layouts, overlap logic, and control line functions.
  • Understanding of test sequencing, verification, and validation of signaling systems within mixed‑mode operation.

• Exceptional analytical and diagnostic skills for reviewing detailed circuit and…