According to existing standards for axle-box test not covering check and analysis of axle-box body, application scope, force types, and load cases were compared among several test standards for bogie frames. It was revealed that standard EN 13749 had the characteristics of wide variety of bogie categories, full consideration to loads, and definite method for force combination, which was suitable for extrapolation and application in strength assessment of axle-box body. During the extrapolating process of standard, the difference in force bearing way, magnitude and kinds of loads between axle-box body and frame were fully considered, so that the force types and the load cases were determined for strength calculation of axle-box body reasonably. Furthermore, with the guide of the extrapolated standard EN 13749, static and fatigue strength analysis for the axle-box body of certain exporting locomotive was accomplished.