Here's a list.
Under construction
• Kitchener-Waterloo - ION (Grand River Transit) - 16 stations - 19km - 2017
• Toronto - Yonge-Spadina Extension (TTC) - 6 stations - 8.6km - 2017
• Ottawa - Confederation Line (OC Transpo) - 13 stations - 12.5km - 2018
• Edmonton - Valley Line Phase 1 (ETS) - 13 stations - 13km - 2020
• Toronto - Eglinton Crosstown (Metrolinx) - 25 stations - 19km - 2021
• Toronto - SmartTrack/GO RER 10 Year Program (Metrolinx) - 14 stations* - 41km - complete 2026
Pre-construction
• Toronto - Finch West LRT (Metrolinx) - 19 stations - 11km - start 2017 - complete 2021 - RFPs
• Montreal - Réseau électrique métropolitain (CDPQ) - 27 stations - 67km - start 2017 - complete 2021 - RFPs
• Mississauga - Hurontario LRT (Metrolinx) - 22 stations - 20km - start 2018 - complete 2022 - RFPs
• Ottawa - Stage 2 South extension (OC Transpo) - 7 stations - 11km - start ? - complete 2021 - RFQ prep
• Ottawa - Stage 2 East extension (OC Transpo) - 5 stations - 5km - start ? - complete 2022 - RFQ prep
• Ottawa - Stage 2 West extension (OC Transpo) - 11 stations - 15km - start ? - complete 2023 - RFQ prep
• Hamilton LRT (Metrolinx) - 17 stations - 14km - start 2019 - complete 2024 - RFQ prep
• Calgary - Green Line (CT) - 14 stations - 20km - start 2020 - complete 2026 - RFQ prep
Planned
• Vancouver - Millennium Line Broadway Extension - 6 stations - 6km - start 2019 - complete 2025 - Business Case Prep
• Surrey-Newton-Guilford LRT - 11 stations - 10km - start 2020? - complete ? - Business Case Prep
• Toronto - Bloor-Danforth Scarborough Extension (TTC) - 1 station - 7.6km - start 2020 - complete 2026 - ERP prep
• Kitchener-Waterloo - ION Phase 2 (Grand River Transit) - 8 stations - 18.5 km - start 2020? - complete ? - alignment
• Edmonton - Valley Line Phase 2 (ETS) - 14 stations - 14km - start 2020 - complete 2025 - planning
• Edmonton Metro Line NW Blatchford Extension 1 station - 1km - start 2020 - complete 2040 - pre-planning
• Montreal Blue Line Anjou Extension (STM) - 5 stations - 6.1km - start ? - complete ? - planning
• Calgary - Green Line Phase 2 south (CT) - 5 stations - 8.2km - start 2026 - complete ? - planning
• Calgary - Green Line Phase 2 north (CT) - 9 stations - 15.1km - start 2026 - complete ? - planning
• Toronto - Sheppard East LRT (Metrolinx) - 26 stations - 13km - start ? - complete ? - planning
• Toronto - Eglington West LRT Extension (Metrolinx) - 11 stations - 11km - start ? - complete >2031 - planning
• Toronto - Eglington East LRT Extension (Metrolinx) - 18 stations - 11km - start ? - complete ? - planning
• Toronto - Yonge Subway Extension-York (Metrolinx) - 6 stations - 6.8km - start ? - complete >2031 - planning
• Montreal Orange Line Bois-Franc Extension (STM) - 1* station - 3km - start ? - complete ? - pre-planning
• Montreal Yellow Line Chemin de la Savane Extension (STM) - 6 stations - 8.7km - start ? - complete ? - pre-planning
• Toronto - Downtown/Yonge Relief Line - (TTC) - ? - ? start ? - complete >2031 - pre-planning
• Surrey-Langley LRT (Translink) - 8 stations - 16km - start ? - complete ? - planning
• Edmonton Capital Line Clareview-Gorman (ETS) - 1 station - 2.9km - start ? - complete 2040 - pre-planning
• Edmonton Capital Line South LRT-Heritage Valley (ETS) - 5 stations - 7.5km - start ? - complete 2040 - pre-planning
• Edmonton Metro Line NW Extension Phase 2 - 7 stations - 6km - complete 2040 - pre-planning
• Calgary - Red Line South Extension - 2 stations - 4.5km - start ? - complete ? - pre-planning
• Calgary - Blue Line NE Extension - 4 stations - 7.5km - start ? - complete ? - pre-planning
• Calgary - Blue Line SW Extension - 1 station - 1.6km - start ? - complete ? -pre-planning
• Victoria Regional Rapid Transit (BC Transit) - 18 stations - 16km - start ? - complete ? - planning
• Victoria E&N Commuter Rail (BC Transit) - 6 stations - 17km - start ? - complete ? - planning
• Halifax Commuter Rail (Halifax Transit) - 11 stations - 50km - start ? - complete >2031 - pre-planning
• Toronto Waterfront West LRT & Waterfront East LRT (TTC) - ? stations - ? km - start ? - complete ? - pre-planning
Completed
• Edmonton - Metro Line (ETS) - 3 stations - 3.3km - opened September 6, 2015
• Vancouver - Evergreen Line (TransLink) - 6 stations - 11km - opened December 2, 2016
• Toronto - Union Pearson Express (Metrolinx) 4 stations - 23.3km - opened June 6, 2015
* mostly station renovations for GO RER, STM/Orange Line
Sources:
http://www.stage2lrt.ca/
http://www.metrolinx.com/en/projects...expansion.aspx
https://ttc.ca/About_the_TTC/Projects/index.jsp
https://www.edmonton.ca/projects_pla...line-west.aspx
https://www.edmonton.ca/projects_pla...-projects.aspx
http://rapidtransit.regionofwaterloo...tage-2-ION.asp
http://www.calgary.ca/Transportation...ect=/greenline
http://www.translink.ca/en/Plans-and...-Projects.aspx
https://bctransit.com/victoria/trans...appened-so-far
http://www2.gov.bc.ca/gov/content/tr...sland/e-n-rail
http://www.halifax.ca/transit/commuterrail.php