Warszawa Olszynka Grochowska railway station is a railway station in the Praga Poà Âudnie district of Warsaw, Poland. As of 2012, it is served by Koleje Mazowieckie, who run the KM7 services from Warszawa Zachodnia to DÃÂblin and by Szybka Kolej Miejska, who run the S1 services from Pruszków PKP to Otwock.