Duncan Duct Bank - Geotechnical Investigation

Timeline:  July 14-15, and July 21-28, 2025*        

*Subject to change pending weather and unforeseen site conditions

What we are doing, and why

TTC will be conducting geotechnical investigation work on Nelson Street, Richmond Street West and University Avenue. This work is necessary to support the upgrades to the Duncan Substation, including replacing an underground duct bank in 2026, as part of the TTC’s Line 1 Capacity Enhancement project. The Duncan Substation Duct Bank Replacement project will upgrade the substation capacity to support the subway traction power system, speeding up journey times and improving subway service on Line 1.

What to expect

• Work will commence as early as July 14 and last approximately two weeks.
• Vibration and noise are expected during the geotechnical investigation.
• There will be traffic lane reductions in the work areas.
• Paid Duty Officers and flag personnel will assist traffic and pedestrians.
• Parking on the north side of Nelson Street will be unavailable during work hours.
• There may be minor disruptions to the sidewalk.
• The work areas will be restored to previous condition upon completion.

Work hours

• Work will take place Monday to Friday between 8:00 a.m. to 4:00 p.m.

Thank you for your patience as we work to improve transit in Toronto.  

For further information, please contact:

Kevin McAnena, Community Liaison Officer,

437-218-0839, kevin.mcanena@ttc.ca