Construction of the Optimization Model of Cargo Transport Network Yanyan Kong, Benfang Tian, Qingyang Wang, Donghui Liu, Yunfei Gao, Chuang Li and Yiwen Zhang E3S Web Conf., 261 (2021) 03013 Published online: 21 May 2021 DOI: 10.1051/e3sconf/202126103013