If any person unlawfully throws or causes to fall or strike at against, into or upon any rolling stock forming part of a train, any wood, stone or other matter or thing with intent, or with knowledge that he is likely to endanger the safety of any person being in or upon such rolling stock or in or upon any other rolling stock forming part of the same train, he shall be punishable with imprisonment for life, or with imprisonment for a term which may extend to ten years.