Metropolitan Council of Greater Minneapolis | Hennepin County Interchange Design-Build
The Interchange Project in Minneapolis, MN, was envisioned and constructed as a multi-faceted program, combining an intermodal transit station and significant public spaces. Adjacent to the Minnesota Twins’ Target Field are a small amphitheater and great lawn where large pre-game events, concerts, and various seasonal events are held. The Target Field Station was officially opened to the public in May 2014, and is considered a huge success.
As part of the design-build team for this project, SYSTRA provided LRT track and systems design and construction support services for all disciplines. The transit aspects of this program included extension of the Metro Blue Line (Hiawatha LRT) to accommodate the new Target Field Station, vehicle storage tracks primarily for game day usage and provisions for future connections of the Southwest LRT and Bottineau LRT lines.
LRT track design scope encompassed alignments, profiles, typical sections, and details (direct fixation track, plinth configurations for turnouts and double-crossover, pedestrian crossings, special arrangements for ductbank crossings and operator walkways). LRT traction power design included simulations, testing and commissioning plans, coordination with utility companies, code analysis, stray current measures, considerations/issues regarding the traction power substation and connections for future lines. LRT overhead catenary design incorporated the extension of mainline tracks 1 and 2 (1,400 track feet), storage tracks 4 and 5 (2,600 track feet), and tie-off provisions for the future line extensions. Design work included the OCS poles, hardware, switches and taps, as well as coordination with track, signal, traction power, and structural disciplines.
LRT signal design encompassed requirements to address the new Interchange Station (side platforms, protected at-grade crossings, special trackwork, power switches, storage tracks, signal equipment room and signal house, related track circuits), and the existing Target Field Station (revised platform track circuits, removal of one wayside signal, reconfiguration of the three remaining wayside signals, new pedestrian signals). The scope for systems safety, reliability, and integration required multiple submittals and other various documents: Safety Assurance Program Plan (SAPP), System Safety Program Plan (SSPP), Reliability Program Plan (RPP), Maintainability Program Plan, Safety Test and Verification Plan, Reliability Demonstration Plan, System Safety and Reliability Test Reports and Final Reliability Test Report.