This is a nice train from HWH-MAS if you are trying to take ticket in 12841 and not getting CNF ticket then you can check on this and this train will provide you CNF/RAC accommodation. 12839/40 runs in a very tight schedule if you compare with 12841 with 12839 then 12839 takes only 01:40Hrs more than 12841 in-spite of having numerous halts. But these two have one thing in common and that is Coromandal/Madras Mail will never disappoints you in terms of punctuality and speed.
If you have got accommodation in AC class then it's very fine for you as AC classes are very neat and tidy but if you go over SL class then there's a little bit of disappointment as...
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SL's are not so good though this train has OBHS (On Board House Keeping) and they never do there work nicely. SL classes runs in high WL through out the year so it will be little bit crowded. I have never taken food items from PC so no comments but you can have food items from VSKP/BZA/BBS and they serves good food items. 12839 has CBC rake so safety is good and you will feel jerks very often.
All the coaches are 2006/2008 made so you will not find 3 pin socket easily, sockets are available on either end of the coaches(near vestibule upside).
I would like write about the comparison of 12839/40 and 12841/42(Only of running time).
12839 HWH-MAS
Time taken 28:05 hrs
Time for total stoppages 01:56hrs
Avg speed = 59.18KMPH
12840 MAS-HWH
Time taken 28:30hrs
Time for total stoppages 01:59hrs
Avg speed=58.32KMPH
12841 HWH-MAS
Time taken 26:25hrs
Time for total stoppages 01:26hrs
Avg speed=62.91 KMPH
12842 MAS-HWH
Time taken 27:05hrs
Time for total stoppages 01:19hrs
Avg speed=61.36 KMPH.