In order to implement this the Mayor of Warsaw Lech Kaczyński established in 2004 the municipally-owned company Szybka Kolej Miejska Sp. z o.o. The company was originally incorporated as a joint venture between the City of Warsaw with 50% shares and the companies Metro Warszawskie Sp. z o.o. with 49% shares and Tramwaje Warszawskie Sp. z. o.o. with 1% shares, both owned entirely by the city and responsible respectively for the Metro and Tram system. As such the company was notably completely independent from the national rail operator PKP Group, unlike Koleje Mazowieckie established by the Masovian Voivodship at around the same time.