Abstract: Swing bolster and side frame,as important components of train bogies,play a crucial role in train movement.The requirements of high-penetration testing facilities for manufacturers to inspect a large number of workpieces are very strong.This paper introduced the large industrial CT system for the non-destructive inspection of the key components of the railway vehicles,elaborated the system design and the scanning flow,Through an example,we demonstrated the non-destructive testing application of industrial CT in imaging a swing bolster and a side frame.The successful practical applications show the industrial CT can be used in the detection of internal structure and defects of swing bolsters and side frames,such as internal air holes,sand and slag inclusions,porosity,shrinkage,cold shut and casting cracks and etc.The performance can meet the requirement of this industry well.