Must nt have any wap assigned for the run, in between JHS-LJN!!!
In this, incoming loco @ JHS for LTT-LJN & outgoing loco @ JHS for LJN-LTT may differ, which act as LSA (Loco Sharing Arrangement) @ JHS and hence, assigned loco @ LTT/IGP isnt free for JHS-LJN run & so diesel run, JHS onwards!!!