Railway Recruitment Control Board (RRCB) is fully organized and operated
 by Government of India under Ministry of Railways. RRCB under Railway 
recruiting boards (Present 19) calling various posts / vacancies through
 direct recruitment and competitive examinations for every year.
Gazetted (Group 'A' and 'B') and Non-gazetted (Group 'C' and 'D').   
Group 'A' Posts -
 Group A posts is carried out by UPSC - appointed through Civil Service 
Exam, Engineering Service Exam, and Combined Medical Service Examination
  
All first appointments to a Group A Post in Railway Service shall be 
made by the President on the recommendation of the Union Public Service 
Commission from time to time in accordance with the rules framed by him.
Recruitment of Group 'A' Officers are made through:
1. Competitive examination held by the Union Public Service Commission (UPSC) Promotion of officers in Group B.
2. Promotion of Officers from Group 'B' Service.
3. By appointment of candidates initially recruited as Special Class 
Apprentices by U.P.S.C. for recruitment to Indian Railway Service of 
Mechanical Engineers.
4. By transfer of an officer in service of the Government.
5. By occasional admission of other qualified persons in consultation with the U.P.S.C.
Group 'B' Posts -
 This posts are not open to directly. The Group B posts link Section 
Officers Grade - upgraded posts from Group 'C' railway employees on 
deputation basis.The group B examination is performed on a Railway depending upon the 
assessment of vacancies as existing and rising . All vacancies in Group ‘B’ are filled by a promotion on the basis
 of selection from eligible Group ‘C employees. 70% of the vacancies are
 filled by seniority cum suitability and 30% by option and selection.
In graduation i would suggest you B.C.A as after doing M.C.A you will have more oppurtunities.
Thanks & Regards
Aarti Gupta
askiitians Faculty