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What are Twin Bankers/Helper/Pusher locos?
Bankers are extra locomotive(s) which are attached at the fag end of the train to prevent extra pressure on couplers between coaches whenever the train has to climb up a steep incline.
For example all trains on Mumbai- Pune route have bankers attached at Karjat and detached at Lonavla in the down direction .No bankers are needed in the reverse direction
A banker is a locomotive that assists in hauling a train up a steep gradient. A banker is attached to the rear of the train and pushes the train from the rear while the normal locomotive of the train pulls it as usual from the front.
Bankers are used for two reasons. One is that, of course, the leading loco may need assistance on a steep gradient. However, a more important reason to have a banker at the rear when ascending a grade is to protect the train from a possibility of coupling failure and consequent parting which would cause a portion of the train to hurtle backwards because of the gradient (guard's brakes being generally inadequate for such a situation). When...
A Locomotive that is used to help the main locomotive of train on sections like hill or mountains .In those sections more tractive effort is required. These locos assist in hauling a train up a steep gradient.
There are Three Locations of Banker loco can be attached.
1)At the front OR/AND 2)Mid-train OR/AND 3)End of the train
Another reason banker loco...