services also have fewer stops than the InterCity services, which goes against the original InterRegio concept of long-distance trains with more local stops. There are no specific rules for the composition for these trains, and both old and new material has been used for InterRegio services. Poland In Poland, interREGIO trains were introduced by Przewozy Regionalne (PR) in spring of , the first IR train connecting Białystok with Warsaw. The fare is similar as TLK-branded fast trains of PKP Intercity. In the beginning these trains operated mostly on Fridays and Sundays along the routes: Wrocław-Kraków, Kraków-Przemyśl, Poznań-Olsztyn, Poznań-Warsaw and Bydgoszcz-Warsaw. Since June 2009 there are more interREGIO trains on routes; most of them are available through the whole week, some of them only on weekends. More routes were introduced, some of which are especially made for students, like Kielce-Częstochowa-Wrocław. InterREGIO in Poland mostly uses older electric multiple units (usually ED72, EN71 and EN57), with newer units on some routes (ED73 and ED59 between Warsaw and Łódź, 14WE between Kraków and Warsaw). Some IR trains are serviced with single- and/or double-decker cars and locomotives. , all IR trains in Poland are second class-only, even though PR's regulations include a first-class fare for interREGIO trains and in service are first-class coaches, yet declassified. Since September 1, 2015 IR trains are only on routes Łódź – Warszawa and Ełk – Grodno (Belarus), due to company's economics and restructuring. The rest were withdrawn or replaced by Twoje Linie Kolejowe express trains. Szczekociny rail crash On 3 March 2012, the Szczekociny train collision occurred, with 15 deaths and 50 injured Hungary The InterRégió trains were introduced in Hungary on . InterRégió trains run mainly on regional lines, but their function is national as well. The trains operate along the lines Sárbogárd–Szekszárd–Baja and Kecskemét–Baja–Dombóvár. InterRégió trains use air-conditioned MÁV 6341 DMU-s which were built by the Russian Metrovagonmash. See also Train categories in Europe References Passenger rail transport in Switzerland Passenger rail transport in Poland Rail transport in Europe