One of the best RSA Pattern by ECoR. A single rake covering the whole Coromandal Coast with CDO at VSKP. RSA Pattern is like this:
Friday: 22801 VSKP MAS Exp Departs from VSKP at 6.55 pm and Arrives MAS on Saturday morning 9.30 am.
Saturday: 22802 MAS VSKP Exp Departs from MAS at 9.10 pm and Arrives VSKP on Sunday morning 11 am.
Sunday:...
more... 22810 VSKP PRDP Exp Departs from VSKP at 11.50 pm and Arrives PRDP on Monday morning 9.10 am.
Monday: 22814 PRDP SRC Exp Departs from PRDP at 11.55 pm and Arrives SRC on Tuesday morning 8.45 am.
Tuesday: 22813 SRC PRDP Exp Departs from SRC at 8.40 pm and Arrives PRDP on Wednesday morning 8 am.
Wednesday: 22809 PRDP VSKP Exp Departs from PRDP at 10.30 pm and Arrives on Thursday morning 8.40 am.
Then From Thursday 9 am to Friday 6 pm , for nearly 35 hours , the rake stays at VSKP CDO for Scheduled Primary maintenance.
So with One Rake the whole stretch from Kolkata to Chennai is covered in a Week.