(g) unlawfully casts or throws any such fluid or substance at or upon any person, or otherwise applies any such fluid or substance to the person of any person, commits a felony and is liable to imprisonment for life. 217. Preventing escape from wreck. Any person who unlawfully— (a) prevents or obstructs any person who is on board of or is escaping from a vessel which is in distress or wrecked, in his or her endeavours to save his or her life; or (b) obstructs any person in his or her endeavours to save the life of any person so situated, commits a felony and is liable to imprisonment for life. 218. Intentionally endangering safety of persons travelling by railway. Any person who, with intent to injure or to endanger the safety of any person, whether a particular person or not, travelling by any railway— (a) places anything on the railway; (b) deals with the railway or with anything upon or near the railway in such a manner as to affect or endanger the free and safe use of the railway or the safety of any such person; (c) shoots or throws anything at, into or upon or causes anything to come into contact with any person or thing on the railway; (d) shows any light or signal, or in any way deals with any existing light or signal, upon or near the railway; or (e) by any omission to do any act which it is his or her duty to do causes the safety of any such person to be endangered, commits a felony and is liable to imprisonment for life. 219. Doing grievous harm. Any person who unlawfully does grievous harm to another commits a felony and is liable to imprisonment for seven years. 220. Attempting to injure by explosive substances. Any person who, unlawfully and with intent to do any harm to another, puts any explosive substance in any place commits a felony and is liable to imprisonment for fourteen years.