I already said that Railway runs on priority, sometimes Rajdhani overtake Rajdhani, Pnbe rajdhani and SK both are top class and top priorities trains joins with HWH rajdhani, hwh rajdhani aur pnbe rajdhani aese priority rkhti h ki Rajdhani ko overtakes kr deti h
NHLN AC sf ko Rajdhani me convert dia jae to priority apne aap mil jaaegi, aur RB ne socha tha isse convert krne ko but don't know why they didn't convert it into raj,