well irfbhai, talking about that, our chutki little 19060 jam-st intercity covers hapa - adi a distance of 320 km in 5.5 hrs flat with avg speed equivalent to that of those sk trains. and mind you hapa - adi is fully diesel (VTV - WDM-3D) and complete single track with crossings of ever important trains like 19005 and 19017 which are much important trains compared to 19060. so, it all depends on the slots that the railway babus manage to squeeze in, i suppose.

---

Yes but still speed of both sk is same which is contrary to the theory of double / electric lines

---

Sir in india we can have doubke , triple or quadruple lines still speed wont go above 60...sppeeds have remained same for 50 years

---

Sir, lot other factors effect speed. traffic density, and no. of stops being major ones.
doubling and RRi being for better traffic (density) distribution, and electrification takes care of Fast acceleration over short distance.

---

gorakhdham exp also one example like this. eventhough diesel engine it is superfast covers 500kms in just 8 hrs

---