@Maersk.146 Sure. A banker or pusher locomotive is used mainly in ghat sections where there are steep gradients.These are attached to the rear end of the train and helps in pushing the train up the ghats . Another 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).
A braker is used ,When descending a grade.The locomotives are attached at the front to provide extra braking power .