Under contract to the Toronto Transit Commission (TTC), EllisDon constructed the Union Station Subway Platform and Concourse Improvements project to improve TTC and GO Transit passenger traffic. The subway platform space doubled in size by constructing a new platform to separate the Yonge and University Lines’ pedestrian traffic. Additional concourse space will also be provided, as well as a pedestrian corridor for GO Transit riders to bypass TTC’s paid area. Scope of work includes new ventilation shafts with fire alarm and fire ventilation equipment and new electrical, mechanical and communication rooms. The structural features include cast-in-place concrete and complex temporary shoring systems and utility support works; the mechanical features include heat conservation piping, unit heaters, split systems and basic access control systems; the architectural features include ceramic tiles, terrazzo borders, glass balustrades and stainless steel.