Yr 5 th line is apt ,section controller will give precedenc without affecting schedule of RT of other train .TN has slack of 45 minutes. In BZA - mas section .so kerala (;although late ) was allowed to proceed first from BZA and TN followed it later .more over kerala. has 24 hour more travel to reach destination.
Late dep of TN did not affect its schedule as it reached mas 6.10 before sch arrival