To create a rake out of normal Coach whch dnt need any Loco reversal, is generally a shuttle!!
Most time, it do hav Coach whch have cable to ensure twin loco (one at each end) to work as single unit (such coach marked with vidyut sign at end above washroom window)!!
Also if rake is of smaller length, single Loco remain stuffed in middle while bth end SLR do hav cabin crew like structure, as in demu/memu, with necessary equipment to control loco frm any end!!
Nw...
more... shuttle & passenger virtually dnt hav any diff & smetimes bth end loco can b witnessed!!
/blog/post/631200 Coach enabled with Cable @ top for Shuttle formation!!