Purushottam express was also least punctual but the moment it got 130 upgraded mps, the punctuality improved a lot. Specially while arriving NDLS.
But compare that to Neelachal or Nandankanan or Odisha Sampark kranti or Jharkhand SJ or Jharkhand SK or SRC ANVT or HLZ ANVT.
Best irony is Odisha SK. This train while going from BBS to ANVT, runs well On time or sometimes before time while arriving MGS, but after that from MGS to ANVT, this train is trolled by nearly all trains enroute.