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This paper addresses the problem of the frequency optimization of transit lines in a congested transit network. We consider the transit frequency optimization model proposed by Constantin and we modify it to consider vehicles capacity indirectly. The model is formulated as a two levels Min-Min optimization problem with the same objective function at both levels. This function represents the transportation time including a congestion penalty. The upper level corresponds to the transit operator's optimization problem and the lower level describes the users' behavior. A descent direction for the problem is obtained by using sensitivity analysis of the lower level problem. Computational results are presented for the Winnipeg (Canada) and the Stockholm (Sweden) transit networks. [ABSTRACT FROM AUTHOR]