On 30 April 2011 PKP EU 07-228 enters Poznan Glowny with a TKL fast train to Warzawa Zachodnia. The difference between Interregio and TKL within the PKP is just the fact, that TKLs are operated by PKP IC (reservation obligated) and the InterRegio by PR (the regional arm of PKP and therefor without reservation duties). 
photo by Leon Schrijvers  Leon2711schrijvers@yahoo.co.uk