A train carrying dozens of schoolchildren derailed Friday in the Austrian Alps, and a carriage ended up on its side in a river, authorities said. 17 people were slightly injured.

The derailment happened at around 7 a.m. on the Mur Valley railway, a narrow-gauge line in central Austria. One carriage of the 3-car train fell into the Mur river, which runs next to the tracks.

The commander of the local rescue services, Anton Schilcher, said 54 schoolchildren were riding the train on the last day before summer break. Seventeen of them were believed to have sustained slight injuries.