The distance for break journey is with limits...Shortest direct route train from Chennai-MMR actually is MAS-NSL is 1486 Kms and MMR is around 23 Kms from NSL...So add its around 1510 Kms.
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If the passengers takes even Charminar the longest distance one between MAS-SC its 781 Kms & Ajanta end to end is 737 Kms so adding makes it 1518 Kms you can clearly see its with in limits infact pretty much same.