Ethiopia has been trying to construct a new railway route that links central Ethiopia to the northern regions. However, this route crossed mountainous terrains which demanded the construction of several tunnels. The failed slope studied in this research is around tunnel 09 entrance portal located along with the new AKH single track railway line phase II. During the excavation of this slope, some cracks were detected and within a short time, these cracks developed into full sliding. All works on the site were stopped immediately for the safety of the employees.rnDuring the design of the above-said slope, the geotechnical ground conditions were defined as rock and 1V:1H slope geometry was selected. However, as construction progressed failure occurred on soil deposits located at the bottom of the slope, which is contrary to the expected rocky condition. The slope inevitably is due to the 1V:1H slope geometry that was used during construction.rnIn this research, limit equilibrium method and finite element method have been used to evaluate the stability of the slope. For LEM, SLOPE/W (GEOSTUDIO, 2012) software has been used to compute the factor of safety, whereas PLAXIS2D software has been used for the FE method. Four cases of unreinforced slopes have been analyzed using both methods. Later, slope stabilization techniques were implemented by reducing slope geometry and reinforcing nails with different inclination angles.rnThree cases from the literature have been analyzed to verify and validate the output result obtained from LEM and FEM software used in this work.