§ 117. Investigation of accidents. The commissioner shall investigate
the cause of all accidents on any railroad or street railroad subject to
his jurisdiction which result in loss of life or injury to persons or
property, and which in his judgment shall require investigation. Every
common carrier shall give immediate notice to the commissioner of every
accident happening upon any line of railroad or street railroad owned,
operated, controlled or leased by it, in such manner as the commissioner
may direct.