Purpose: Material choice and construction development of sliding wall for interchangeable body with expanding side walls and roof. Methods: Development and calculation of interchangeable body sliding wall construction were being fulfilled according to several technical-normative documentations with the help of engineering programs COMRAS- 3Dv18.1 and SOLIDWORKS 2016. Mechanical trials of samples were held on the basis of Petersburg Transport University in Mechanical Laboratory named after Prof. Belelyubskiy N. A. Results: interchangeable body slide door construction has been developed. The variants of samples of interchangeable body side wall of various materials and construction are proposed. Sample “on location” trials to define mechanical properties were pursued. The results on experimental and theoretical research to define stress-deformable sample states for interchangeable body sliding side walls ‘re given. Practical importance: The developed construction of sliding wall with various material application makes it possible to lower tare mass of new being projected interchangeable and removable bodies with expanding slide walls and roof wherein preserving own strength characteristics.