Principal Mechanical Engineer - Rail and Transit Leader

TYLin's Rail + Transit team seeks a Principal Mechanical Engineer to lead design and delivery of HVAC, tunnel ventilation, and vertical transportation systems for North American transit infrastructure. This senior role combines technical leadership with project management, overseeing design packages, calculations, and QA/QC while coordinating with architects, structural, electrical, and life-safety teams. A PE license is strongly preferred and 15+ years in rail or complex facilities are expected.