In respect of these persons, the relevant provi sions are as follows: "2(1)(a) 'Appointing Authority ', in relation to railway servant, means: (i) the authority empowered to make appointments to the service of which the railway servant is, for the time being, a member or to the grade of the Service in which the railway servant is, for the time being, included, or (ii) the authority empowered to make appointments to the post which the Railway servant, for the time being holds, or (iii) the authority which appointed the Railway servant to such Service, grade or post, as the case may be, or (iv) where the Railway servant having been a permanent member of any other Service or having substantively held any other permanent post, has been in continuous employment under the Ministry of Railways, the authority which appoint ed him to that service or to any grade in that Service or to that post whichever authority is highest authority".