Ye jo 34 km/hr wale SF trains hain wo SLIP trains hain jinka attach/detach station par kayi ghanto ka halt hota hai. Iske kaaran inka avg. speed kam ho jaata hai.
Aur main maanta hun ki kuch SF trains aise hain jinke avg. speed 55 km/hr se kam hain. Uss case mein jaisa Sourasish Ji ne kaha
"Those are glitches and cheats of IR...We should follow the general rule in case of IMG trains...", applicable hai :)