20503/4 ko 12423/4 ke route pe chalana chahiye. 12423 ki average GHY se already 69kmph ki hai aur ab route pe kaafi doubling and electrification ho gaya hai toh speed up karke 75kmph tak doono trains bhi chala sakte hai. Aur ab 20503/4 ki frequency bhi increase ho rahi hai so Northeast waalo mai kaafi popular hoga