In this paper the strength calculations of a flat wagon are presented.These calculations are carried out in accordance with European standards,but in practice,often,calculations and tests are carried out by a shortened procedure not in accordance with the standards.On the other hand,the procedures prescribed in the standards do not always cover all aspects of the actual operating conditions.Based on the satisfactory results of the calculations,the notified body often admits the wagon into service.Under real working conditions it is established that the structural integrity of the wagon underframe is impaired due to loads not clearly reflected in the standard and are therefore not taken into account either in the calculations or when the wagon is admitted into service.Some activities have been done in order to reinforce the problem areas and a repeated extended strength analysis has been carried out with the loads not described in the normative documents.Subsequently,after the reinforcing measures had been taken,the wagon was admitted back into operation.A proposal for specification of such problems in the European standard EN 12663-2:2010 is given.
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