Frauds endangering trains or vessels

Every person who– (a) in constructing or repairing any vessel or any machinery or fittings for a vessel, or any engine, carriage or apparatus, to be used on or forming part of a railway, knowingly uses such materials, or so does any work or so conceals any defect, as that the safety of the vessel, or of any person on board the vessel or who may use the railway, is likely to be endangered, shall be liable to imprisonment for ten years; (b) supplies for use on board a vessel any medical or surgical stores or instruments, or any life belt or apparatus for saving life, of such inferior quality or in such a condition as to be substantially unfit for the purposes for which the same are supplied, or as to be likely to endanger life, shall if he do so knowingly be liable to imprisonment for five years, or shall if he do so negligently be liable to imprisonment for two years.