The Railway Ministry has roped in the Railway Recruitment Board (RRB) to conduct all departmental promotion examinations through a centralised computer-based test, officials said on Wednesday. The decision comes a day after the Central Bureau of Investigation (CBI) arrested 26 railway officials of East Central Railway in Uttar Pradesh’s Mughal Sarai for allegedly leaking papers of a departmental examination and seized Rs 1.17 crore cash during its raids.