@ptrc @darkphoenix despite the fact that we have just 3 long distance categories, in reality there are six of them
EIP - EIC but with pendolinos and slightly more expensive fares
EIC - express ran on commercial rules
4-digit IC - express ran on PSC rules
5-digit IC - fast train ran on PSC rules
however,
EIC/EC - EuroCity express ran on commercial rules
IC/EC - EuroCity express ran on PSC rules
ECs do have a second 5-digit number outside of the 2/3-digit ones so they do not fall into the 5-digit IC area, and are not called EC in poland