Warszawa Centralna Train Station

 Left luggage is located in the underground corridor that runs below the main hall. Look for Przechowalnia Bagażu, where stewards will look after your bag, or opt for one of the plentiful lockers. Connect to a Polish network via mobile by getting SIM and pre-paid cards from the same newsagents.
 

Wrocław Main Train Station

lockers and a left luggage service

 

 

Gdansk

The bus and train stations at Gdansk have something of a luggage locker crisis. They have approximately 1% of the actual number of lockers they need, and about 75% of the lockers they do have are broken. Yup, that means that about 0.25% of travelers who need luggage lockers will get one.

Fortunately, there is a somewhat-hidden left luggage room in the basement of the train station. If you can't get a locker for your bags, definitely consider leaving them here. Similar facilities cannot be found in the bus station.

 

Katowice railway station
luggage lockers

Krakow main railway station
Baggage consignment

Poznan Gl.:
luggage lockers

Wrocław railway station
Baggage lockers and a left luggage service,