Its just a SPL!! TT drafted as such not to disturb regular running JS & other trains & definitely will give pass, in case crossing situation arises (pass not OT)!! JS is always delayed in departing MAO & 15:20 is perfect DEP for Shatabdi, after reular running JS would have crossed Karmali (& will not have to suffer disturbance afterwards coz of this SPL)!!
Further, its not just for CSTM but PNVL etc too offer as connectivity option & ARR there is quite reasonable!! If people cant prefer train as option, when they dont have any ticket provision in other train, then this train will always be in issue!!
PS:...
more... Its SPL & kindly take it as SPL not regular streamlined Shatabdi, for the time been!!