<p><span style="caret-color: rgb(51, 51, 51); color: rgb(51, 51, 51); font-family: Georgia, serif; font-size: 17px; letter-spacing: 0.10199999809265137px; background-color: rgb(252, 252, 252);">Intelligent water drops (IWDs) algorithm is extremely effective heuristic procedure that is believed to have wide applicability for generating optimum solutions for the traveling-salesman problem in combinatorial optimization problems. Urban transit network design and frequency setting (TNDFS) are a combinatorial optimization problem that attracts the attention of researchers. In this study, computational results with IWDs for Mandl benchmark TNDFS problems are reported and compared to a few other meta-heuristic approaches.</span><br></p>