Suicide of young boy in Tajrish Subway

A young boy threw himself under the train in Tajrish
station of Tehran Subway but he survived despite mutilation. 
According to
witnesses, he suddenly threw himself under the train when it became closer, but
the fast reaction of train deriver caused to he saved from definitely death,
whereas her toes was been cut. 
This event had shocked for many of passengers. Yet, it is
not clear why he did this trouble act. 
Nevertheless, the suicide in subway is
the kind of suicides that has many pain, whereas if the person does not killed
by train crash, he will kill by the high voltage of the rails or has to suffer
the amputation.