Robert Schwandl's Urban Rail Blog: HELSINKI Tram - Metro - Suburban Rail
Transit Maps: Submission – Unofficial Map of Helsinki Tram Network by Elmo Allén
3B/3T Helsinki Sightseeing Guides | Food Trippin'
File:Helsinki tram map.png - Wikimedia Commons
Planned extension of the Helsinki tram network - Wikipedia
Helsinki tram line 2 with articulated tram 33 at Kauppatori/Salutorget (2008) - Tram Travels
Helsinki by Tram
Helsinki lines open | News | Railway Gazette International
History of the Helsinki tram system - Wikiwand
Tallinn 2011 - European Capital of Culture - By the way, The 3T idea is quite clever, isn't it? In case you don't know, there's a No 3T tram line in Helsinki.