The incident occurred on a railway line used exclusively by freight trains.
Several railcars left the embankment and some of them overturned.
No leaks were detected from tank cars carrying oil, and no injuries were reported, according to Karol Jakubowski of the Polish railway infrastructure manager PKP PLK, speaking to Polish Radio.
Firefighters and police responded to the scene, and the derailment will be investigated by a specially appointed State Commission for Railway Accident Investigation.
The cause of the incident has not yet been confirmed, though Deputy Interior Minister Wiesław Szczepański told RMF FM radio that a failure of the overhead power system due to low temperatures may have been responsible.
The Warsaw Metropolitan Police also supported this version of events, stating that according to preliminary expert assessments, the most likely cause of the incident was operational factors combined with the prevailing weather conditions.
(mp)
Source: IAR/Polish Radio/RMF FM/PKP PLK/X/@Policja_KSP