Not a hard and fast rule...
Poorva and AP: 3 rakes
Purrushhottam and TN: 4 rakes...
And Sir I dont think ki itni bhi dikkat hoti hogi bcoz agar aap last 1 year me dekhe to bahut se rakes LHB nikale back to back: SC-SHM AC, BKN-MAS AC, KYQ-YPR AC, MAS-SRC AC, Shree Shakti Express (2 rakes), LTT NZM AC + conversion of PUNE...
more... SC Shatabdi to LHB, RNC Rajdhani to LHB, Karnavati to LHB, Purushottam to LHB, AII Shatabdi to LHB, INDB YPR Exp, BKN BSP Special, NZM TVC Exp (Not yet introduced) etc...
I dont understand ki sleeper LHB coaches nikalne me RCF itna slow kyu hai???
AC coaches zyada nikal rahe hai...