May be due to the late arrival of mail @hwh by more than 3 hrs.. but still SER cleaning staffs had more than 7 hrs till the departure of the rake as 12841 coro. Couldn't they clean it in 7 hrs and make it ready for departure on its scheduled time? I have always noticed that whenever mail arrives late by more than 2 hrs @ hwh then coro gets rescheduled.. i don't know how much time the cleaning staff needs for cleaning the rake.