As per this document, is there any RSA between Lucknow Shatabdi, Kalka Shatabdi and Amritsar Shatabdi?
Because consider the case for 12951/52 and 12953/54, 5 rakes is given in common to both. Same with the case for 12303/04/81/82 Poorva Express, 3 rakes given common to both. In both cases, RSA exist between two pair of trains.