There is also another way. 12841 Coromandel can depart from HWH or SHM at 7:00am (like its counterpart from MAS). In that case it will reach MAS at 10:30 and can depart as 12840 MAS HWH mail at 13:30 reaching HWH 17:30 itself.
As for 12864, it should depart SMVB in the evening only, as earlier, and reach HWH at 6am.