VBL 150. 1.6.2004 Hw Vallila.
I am sorry but I must answer in English.
HKL 150 is only a charter tram. Usually it is in Btf Koskela.
To see any charter tram in traffic by chance is like “winning a lottery”.
Best way to see one is to hire it (HKL 150: 350 ¤ / 2 hours, Monday - Saturday).
If an individual wants to visit the depots, one must personally contact Helsinki City Transport.
(http://www.hel.fi/wps/portal/HKL_en/?WCM_GLOBAL_CONTEXT=/en/Helsinki+City+transport/)
Finnish Tramway Society (suomen.raitiotieseura@kolumbus.fi) can and will help groups that want to visit the depots and / or want to ride “an own” tram.