ADDIS ABABA UNIVERSITY ADDIS ABABA INSTITUTE OF TECHNOLOGY SCHOOL OF MECHANICAL AND INDUSTRIAL ENGINEERING GRADUATE PROGRAM IN RAILWAY ENGINEERING Fatigue Durability Analysis for Welded Bogie Frame of AALRT BY: Ruhama Minwuyelet A Thesis submitted to the School of Mechanical and Industrial Engineering in partial fulfillment of the requirements for the Degree of Masters of Science in Mechanical Engineering (Railway stream) ADVISOR: Dr. Daniel Tilahun June, 2016