The phrase you provided "o psie który jeździł koleją" is Polish and translates to "about the dog who traveled by train." This phrase is well known as the title of a children's story written by Roman Pisarski. The story is about a dog named Lampo who was found on a railway station, adopted by the stationmaster, and who famously traveled by train around Italy. Lampo became known for his intelligent and independent nature, developing a strong bond with the railway workers and locals. The story emphasizes themes of loyalty, adventure, and friendship. This tale has also been adapted into a film and remains a popular cultural reference in Poland related to a dog that rides trains.

Hence, your text "[o psie który jeździł koleją](javascript:void(0))" means "about the dog who traveled by train" in Polish. It is a reference to this beloved children's story about Lampo, the traveling dog in Italy.