ATHENS (AP) -- A commuter train collided head-on with a freight train Thursday in Athens, injuring 53 people, authorities said.

No one was seriously hurt in the 7:25 a.m. crash in the western suburb of Sepolia, according to a statement from the state-run Hellenic Railways, which was confirmed by officials at three state hospitals where the injured were taken. The cause of the accident was unclear, but the Greek Railworkers' Association said the two trains were using the same track. "This is the kind of practice that will lead to an accident sooner or later," the association's leader Andreas Vassilopoulos said. "These two trains should not have been using the same track." The passenger train was headed to the port of Piraeus, south of Athens, when the collision occurred. Neither train derailed. Hellenic Railways has had several accidents this year. In February, a freight train transporting armored personnel carriers for the Greek army derailed in northern Greece. In March, three people were killed when a passenger train hit a car at a crossing 20 miles north of Athens. The next month, a passenger train hit a truck at a crossing in northern Greece and derailed, killing four people and injuring at least 40. And in May, a freight train carrying liquid fuel caught fire following a derailment