I was fortunate to travel in this beauty twice in 1979 and 1980. What an amazing livery it had - bright yellow and vermillion red. Halts when introduced - TATA, ROU, DURG, NGP, AK, BSL and tech halts at BSP and IGP. Within a year, Dadar was introduced and BSP became commercial. And IGP became commercial only in Dn. And that is how it was when I traveled in 1979. But cracking runs - simply blew past NK raising a cloud of dust. And zero unauthorized pax in SL.