Arriving from abroad, you will probably enter Poland at Chopin’s airport in Warsaw.
From there (Warszawa Lotnisko Chopina), you may take a direct train to Warsaw Station (Warszawa
Zachodnia or Warszawa Centralna) and then you might take a train directly to Lodz (Łódź Kaliska Station or Łódź Widzew Station).
The central PKP railway station Łódź Kaliska is situated near the city center at al. Uni Lubelskiej 3/5.
PKP information: +48 42 1 94 36 | website: http://rozklad-pkp.pl/en
Trains to Lodz leave about every hour and the journey takes more or less 1,5 hrs.