Three people were injured on Monday when two trains collided in southern Poland, a fire brigade official said. "A passenger train rolled on to a track and crashed into another train stopped at the station of Swinna," regional fire brigade spokesman Jaroslaw Wojtasik told Reuters. "As a result of the low speed collision one of the trains derailed and three people were injured. It is not clear if this was the result of a human or mechanical error." PAP news agency reported that state rail company PKP has switched to bus transport on the route between the mountain resorts of Zywiec and Sucha Beskidzka while the track is blocked.