Transport Capacity Expansion Method of Urban Rail Transit Lines with Seriously Unbalanced Directional Passenger Flow in Peak Hour

The definition of seriously unbalanced directional passenger flow in peak hour is presented. Then the background and operation situation of the IRT Flushing Line′s triple-track reformation and the Jōban Line′s quadruple-track reformation are investigated and analyzed. Compared with quadruple-track reformation, triple-track reformation can save costs and use transport capacity effectively, while having difficulty in vehicle scheduling. Shanghai Metro Line 6 is taken as an example to discuss the possibility of expanding transport capacity by triple-track reformation. Targeting the vehicle scheduling difficulty for the train on third track, two strategies that single-track operation mode and reorganization of non-peak direction train are proposed.