In early days, loco used to detach from behind, travel all the way back n re-attach themselves to the train n move on.
But the process is completely changed as VSKP has a reserve trip shed.
as soon as the train enters, the assigned loco comes out from trip shed, proceeds towards the train n attaches itself, meanwhile the loco which hauled the train, gets detached n heads towards the trip shed for rest n wait till next allotted link.
Hardly,...
more... the process takes 10-15 mins in just attaching a loco/detaching.