During the examination of hygiene and sanitary module cage of the car, its strength under the loading of vertical, linear and profile forces in conformity with the standard design conditions has been estimated. The finite-element model was being developed in parts, which were being constructed and digitized simultaneously by several specialists and then were framed into one unit. Such approach in this case is the most practical because of very high complexity of representation the cage construction in the model. Usable model is a complex one: elements of different types - plates, beams and special elements for the bolt clamp - have been used in it. Calculation has been done in the nonlinear formulation, which allowed to ascertain the stress thickeners condition and to improve the cage construction through changing the position of some elements.

Calculation of the railway carriage reaction to the exploitation loadings with its strength determination is an urgent investigation in the field of railway entities strength calculations. In the strength analysis of the railway carriage elements and its construction as a whole in the process of development of the finite-elemental model there have been considered geometrical dimensions, material deformative characteristics and active loadings. Loading complex consisted of the carriage own weight, weight of equipment and people situated inside the carriage, as well as impingement attack caused by the carriages coupling.

Characteristics of the deflected mode, obtained in the process of calculation, allowed to estimate general strength of the railway carriage construction, to find the strain concentrators, as well as the places of maximal drifts. The obtained results allow to improve the carriage construction and to optimize some of its elements for its better operation.