"Their purpose is to convert power into the 750-volt direct current that runs through the overhead wires and powers the line’s light-rail vehicles...." (Mass Transit, 2022)
References:
Mass Transit. (2022, July 11th) Majority of traction power substations installed for Metrolinx's Finch West LRT. Retrieved from Mass Transit: Majority of traction power substations installed for Metrolinx's Finch West LRT | Mass Transit (masstransitmag.com)
Published on July 12, 2022