Trains

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there are several rail operators in Poland:

PKP Przewozy Regionalne - local and fast (P, Pospieszny) trains without seat reservation

PKP Intercity - IC, EC, EN, Ex(express), TLK (Cheap Rail Lines) trains - all with seat reservation. PKP IC serves the only daylight connections on Warszawa-Gdansk-Gdynia and Warszawa-Poznan lines. It is also the owner of restaurant, sleeping and couchette cars.

Koleje Mazowieckie - local passenger trains in Warsaw area and a summer slow train to Gdynia "Sloneczny"

Szybka Kolej Miejska (SKM) - some local and city more..

Buses in Poland

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Buses in Poland are known under the name of PKS. It isn't a single company, but several local PKS's.

PKS tend to be slow old buses, that stop in every possible town between your start and end destination. Apart from PKS, there are other companies such as Polski Express or Poktourist that often have a better offer.  These companies, while operating express type services, operate a first come first served seating arrangement, often have a contact number that is answered reluctantly by unhelpful staff, so often it is simply best to arrive at the pick-up point in more..