most of the day, one train an hour runs through to Milanówek Grudów, with most of the other trains running through to Grodzisk Mazowiecki Radońska. All trains stop at all stations on their route, and a journey from Warszawa Śródmieście to Grodzisk Mazowiecki Radońska takes just under one hour. Within Warsaw's borders, WKD accepts day tickets and transit passes issued by the Public Transport Authority. See also Szybka Kolej Miejska (SKM) - Rapid transit and commuter rail system in the Warsaw metropolitan area. Koleje Mazowieckie (KM) - Regional rail operator in the Masovian Voivodeship of Poland. Polskie Koleje Państwowe S.A. - Dominant railway operator in Poland. Polregio - Polish railway operator; formerly Przewozy Regionalne. References External links Official website (in English) Transport in Warsaw Railway companies of Poland Railway lines in Poland Polish Limited Liability Companies