Związek Pracodawców Kolejowych is the association founded in 2001.
According to PR-model, zpkpkp.pl is ranked 2,368,990th in multilingual Wikipedia, in particular this website is ranked 107,888th in Polish Wikipedia.
The website is placed before pythonawesome.com and after drobytskyyar.org in the BestRef global ranking of the most important sources of Wikipedia.