Fereidoon Moghadas Nejad - Associate ProfessorDepartment of civil and environmental engineering, Amirkabir University of Technology
Nasser Taheri - M. Sc. StudentDepartment of civil and environmental engineering, Amirkabir University of Technology
Hamzeh Zakeri - Ph.D Candidate Department of civil and environmental engineering, Amirkabir University of Technology

This paper deals with some related methods in the realm of soft and hard developments which currently employed inspection and health monitoring condition in railway domains. A brief review of Non- Destructive Testing (NDT) is presented in this paper. NDT based inspections are categorized into threegroups: 1) Visual, 2) Semi-Automated and 3) Full-Automated. NDT technologies are useful for real-time management and will improve the ability of long-term predictive models. At the end of each part, positive and negative points of each method have been discussed and finally ongoing advancements have beenaddressed.

Non-Destructive Testing, Rail Defects, Automated inspection