“…For train 2 and train 4, they must stop at all stations to satisfy container demands. Furthermore, the detailed container distributions (i.e., q 1 AB , q 1 AC , q 1 AD , q 1 BC , q 1 BD , and q 1 CD on train 1; q 2 AB , q 2 AC , q 2 AD , q 2 BC , q 2 BD , and q 2 CD on train 2; q 3 AB , q 3 AC , q 3 AD , q 3 BC , q 3 BD , and q 3 CD on train 3; and q 4 AB , q 4 AC , q 4 AD , q 4 BC , q 4 BD , and q 4 CD on train 4), which are represented by different coloured rectangles, are also illustrated in Figure 3.…”