Helsinki Metro (English Wikipedia)

"Perustietoja ja metroasemat" (in Finnish and English). Finnish Railway Society. Retrieved 30 August 2022. Gauge: 1522 mm
"Helsinki metro cars". SRS. Archived from the original on 8 January 2010. Retrieved 11 October 2010.
"Metro Helsinki, historic survey". Finnish Tramway Society. 3 May 2010. Archived from the original on 14 September 2017. Retrieved 8 July 2010.
"HKL Metro Transport: Metro EMU's M1 - M6". Finnish Tramway Society. Archived from the original on 24 August 2017. Retrieved 8 July 2010.
"HKL Metro Transport: Metro EMU's M200". Finnish Tramway Society. Archived from the original on 27 September 2013. Retrieved 8 July 2010.

reittiopas.fi

"Linja M1". Uusi Reittiopas. Retrieved 2017-11-18.

tekniikkatalous.fi

"Metron käyttäjämäärät kasvussa – alkuhuuma kuitenkin hiipui nopeasti". www.tekniikkatalous.fi. 23 November 2017.

web.archive.org

"Helsinki City Transport - About HKL - History - A brief history of the metro". Helsinki City Transport. 19 March 2012. Archived from the original on 12 May 2015. Retrieved 21 September 2013.
"Työskentely metroradan läheisyydessä" (PDF) (in Finnish). Helsinki City Transport. Archived (PDF) from the original on 15 August 2022. Retrieved 16 August 2022.
"Helsinki metro cars". SRS. Archived from the original on 8 January 2010. Retrieved 11 October 2010.
"Metro Helsinki, historic survey". Finnish Tramway Society. 3 May 2010. Archived from the original on 14 September 2017. Retrieved 8 July 2010.
"HKL Metro Transport: Metro EMU's M1 - M6". Finnish Tramway Society. Archived from the original on 24 August 2017. Retrieved 8 July 2010.
"HKL Metro Transport: Metro EMU's M200". Finnish Tramway Society. Archived from the original on 27 September 2013. Retrieved 8 July 2010.
"Ruoholahden ja Kampin asemille pääsee taas metrolla". Helsinki Sanomat (in Finnish). 2009-11-11. Archived from the original on 2009-11-12. Retrieved 2009-11-11.
"Rautatientorin metroaseman hissit käyttöön". Helsingin Sanomat. 2010-06-21. Archived from the original on 2010-06-24. Retrieved 2010-07-31.
"Metroliikenne 18.11.2017 alkaen" (in Finnish). Helsinki Regional Transport Authority. Archived from the original on 2019-02-02. Retrieved 2017-11-18.
"Metro laajeni Matinkylään 18.11.2017". Archived from the original on 2016-03-16. Retrieved 2016-03-19.
Helsingin Sanomat. "Helsingin valtuusto päätti metron automatisoinnista - HS.fi - Kaupunki". HS.fi. Archived from the original on 2007-09-30. Retrieved 2009-11-09.
"Helsingin kaupunki". Hel.fi. Archived from the original on 2007-12-03. Retrieved 2009-11-09.
Salonen, Juha (2005-02-05). "Seed of new subway line sprouting in basement of Kamppi complex". Helsingin Sanomat. Archived from the original on 2012-03-08.
Salonen, Juha (2005-02-13). "From the westbound line to the airport". Helsingin Sanomat. Archived from the original on 2012-03-08.
Hannula, Tommi (2007-09-17). "Juna ei saavu koskaan ensimmäiselle metroasemalle (First Metro station will never be used)". Helsingin Sanomat (in Finnish). Archived from the original on 2018-09-03. Retrieved 2018-09-02.
Minja Rantavaara (2019-04-29). "Helsingin uusimman ostoskeskuksen kellariin rakennetaan metroasemaa, jota ei ehkä koskaan tulla käyttämään". Helsingin Sanomat. Archived from the original on 2019-04-29. Retrieved 2019-05-23.
"Helsinki City Transport – a key player in a sustainable city" (PDF). Archived from the original (PDF) on 2008-04-10.

wsj.com

Grove, Thomas (14 July 2017). "Beneath Helsinki, Finns Prepare for Russian Threat". The Wall Street Journal. Retrieved 14 July 2017.

yle.fi

"Uudessa metrossa 90 metriä avointa tilaa – liikenne alkaa linjoilla M1 ja M2". Yle Uutiset. 3 May 2016.
"Helsinki expanding eastwards". YLE. 25 October 2018.