An efficient heuristic method for joint optimization of train scheduling and stop planning on double-track railway systems. - Morteza Boroun; Somayeh Ramezani; Nazanin Vasheghani Farahani; Erfan Hassannayebi; Saina Abolmaali; Masoud Shakibayifar (INFOR Inf. Syst. Oper. Res., 2020)