Downtown Redmond Link Extension
Connecting Redmond with the greater Seattle area.
Connecting Redmond with the greater Seattle area.
Overview
This design-build project involved a 3.4-mile light rail extension on Sound Transit's system.
Scope of Work
Modern Railway Systems’ (MRS) scope includes the design, furnishing, and integration of two traction power substations, overhead contact system (OCS), signal systems, and communications systems.
Communications Scope
MCS provided engineering and commissioning services for the communications subsystems at two stations and one parking garage constructed by SWK. The communications scope also covered traction power substations (provided by MEC), signal bungalows (provided by MRS), emergency access points (EAP), and trackway intrusion detection (TID) equipment along the wayside.
Unlike previous Sound Transit projects, MCS assembled and wired all communications racks and cabinets in Denver prior to installation. The communications subsystems included Closed-Circuit Television (CCTV), emergency and back-of-house phones, audio and visual public address systems, access control, radio, and Supervisory Control and Data Acquisition (SCADA) systems for train control, building management, and emergency ventilation.
Signals Scope
MRS provided comprehensive train control design, furnished wayside equipment, and conducted integrated testing of the train control subsystem for the Downtown Redmond Link project. This extension continues the East Link alignment from Redmond Technology Station near the Microsoft campus into Downtown Redmond.
MRS delivered three signal bungalows, designed and manufactured by MMI, and partnered with Alstom/KB Signaling for train control system design. The wayside scope included switch heaters, wayside signals, impedance bonds, switch machines, and TWC loops, installed by contractor partners.
Impact
The Downtown Redmond Link Extension will expand regional connectivity, improve commuter access, and support Sound Transit’s vision of a sustainable and efficient light rail network. The new systems enhance operational safety, streamline train control, and enable more reliable and resilient service. By integrating advanced communications, power, and signaling technologies, MRS and its partners are helping to deliver a modern, high-performing transit extension that strengthens mobility across the greater Seattle area.
Redmond, WA
Light Rail
Design-Build
2024
Sound Transit
Stacy Witbeck
Northwest
