The parameters selection, structural features and technical measures for optimising the structure of axle gear box for CK series meter-gauge locomotive were represented in this paper.

Discussion on the wheel flange thickness measuring basis for meter-gage locomotives;

The structural design, calculation and analysis of the car body for CKD7F meter-gage locomotive exported to Viet Nam were described, and the test results were introduced.

To meet the requirement of speed upgrading of passager traffic in mountain railway with nnumbers of curve lines of small in radius,DF_(11) series locomotive with full-suspension and three-axle radial bogies are suggested to be developed.