15.6 km rapid transit line from Exhibition Place to the Ontario Science Centre with 15 stations.
Successor to the Relief Line. Tunnelling began 2024. Current budget $19.2B, up from initial $10.9B estimate.
Original Approved(2020)
$10.9B
Current Approved(2024)
$19.2B
Budget Variance?The change between a project's originally approved budget and its current approved budget. Positive numbers mean the budget grew (over original); negative means it shrank. Only projects with multi-year history can show a variance.· 3 cycles
$8.3B(+76.1% over original)
Original (2020)
$10.9B
Current (2024)
$19.2B
Dec 31, 2019
·Metrolinx Initial Business Case
Initial business case approved with a $10.9B capital envelope for a 15.6 km rapid transit corridor between Exhibition Place and the Ontario Science Centre.
Read the source →Oct 30, 2021
·Ontario Cabinet, October 2021
Budget revised upward by $6.5B (+59.6%) after scope expansion to include the eastern terminus station and an integrated maintenance facility. Province cited revised demand forecasts and construction-cost inflation as principal drivers.
Read the source →Mar 23, 2023
·Province of Ontario, 2023 Budget
Budget revised upward by $1.8B (+10.3%) on the 2023 provincial budget. Attributed to construction inflation and supply-chain adjustments for tunnelling and station civil works.
Read the source →No linked sources yet. Sources are matched automatically during data ingestion.
Project record last updated: 4/2/2026