Where does the delay data come from?

From PKP PLK data on running trains processed by mkuran.pl, the same data the map shows. The list is worked out again every time the page loads.

How late does a train have to be to appear here?

At least 5 minutes at the last station it passed, according to the source. Shorter delays count as running on time.

No. It shows only the trains the source reports right now. A train missing from the list is not necessarily on time: check its own page.

Now in the live data: 27 trains, 9 of them at least 5 minutes late (15 min on average).

Largest delay: 37 min. Latest passage in the data: 01:24.

+37 min
TLK 38170/1 Ustronie
Kraków Główny → Kołobrzeg
passed Radom Główny at 01:17 · next station: Warka
+27 min
IC 38172/3 Podhalanin
Zakopane → Świnoujście
passed Częstochowa at 00:54 · next station: Radomsko
+16 min
IC 61170/1 Karkonosze
Jelenia Góra → Warszawa Wschodnia
passed Krotoszyn at 01:13 · next station: Ostrów Wielkopolski
+11 min
IC 83172/3 Podhalanin
Świnoujście → Zakopane
passed Ozorków at 01:17 · next station: Zgierz
+10 min
TLK 53170/1 Karpaty
Gdynia Główna → Zakopane
passed Piotrków Trybunalski at 01:09 · next station: Radomsko
+9 min
IC 461 Baltic Express
Gdynia Główna → Praha hlavní nádraží
passed Bydgoszcz Leśna at 01:18 · next station: Bydgoszcz Główna
+8 min
IC 460 Baltic Express
Praha hlavní nádraží → Gdynia Główna
passed Poznań Główny at 01:16 · next station: Gniezno
+7 min
IC 82170/1 Uznam
Świnoujście → Chełm
passed Szamotuły at 00:47 · next station: Poznań Główny
+6 min
R90 15409
Warszawa Zachodnia (Peron 9) → Mława
passed Ciechanów at 01:06 · next station: Czeruchy

Where does the delay data come from?: From PKP PLK data on running trains processed by mkuran.pl, the same data the map shows. The list is worked out again every time the page loads.
How late does a train have to be to appear here?: At least 5 minutes at the last station it passed, according to the source. Shorter delays count as running on time.
Does the list cover every train in Poland?: No. It shows only the trains the source reports right now. A train missing from the list is not necessarily on time: check its own page.