Why doesn't the train stop at all stations?

Travelling by PKP Intercity and Pendolino fast trains is characterised by a short journey time due to the high maximum speed and a small number of intermediate stations. The trains stop only at selected stations in larger cities, which saves time.

TLK trains - Twoje Linie Kolejowe - are characterised by longer journey times and a higher frequency of journeys. The train stops at all railway stations through which the route passes.