// -- capacity determined according to specific labels that might need to be handled, and otherwise cargo class -- //

    switch (FEAT_ROADVEHS, SELF, acton_switch_cargo_capacity_by_cargo_0, cargo_classes) {
        bitmask(CC_MAIL): return 68;
        return 34;
    }

    switch (FEAT_ROADVEHS, SELF, acton_switch_cargo_capacity_by_cargo_1, cargo_classes) {
        bitmask(CC_MAIL): return 100;
        return 50;
    }

    switch (FEAT_ROADVEHS, SELF, acton_switch_cargo_capacity_by_cargo_2, cargo_classes) {
        bitmask(CC_MAIL): return 134;
        return 67;
    }