AGMAtty. Diosdado N. Silva, the Assistant General Manager of the Philippine National Railways (PNR), graduated from the Ateneo de Manila University School of Law in March 1983, and in the same year passed the November 1983 Bar Examinations. He obtained his BS in Commerce degree, major in Economics and minor in Finance in 1975 at the Philippine College of Commerce, now Polytechnic University of the Philippines.

Prior to his appointment as AGM of the PNR in March 2014, Atty. Silva was the Head Executive Assistant to the Administrator of the Light Rail Transit Authority (LRTA) from 16 August 2010 to 31 March 2012. Likewise, Atty. Silva has had 28 years of varied law practice covering labor, civil, criminal and commercial law cases.