The correct answer is: A. Hump Yard
Fly shunting is a type of railway yard operation in which locomotives push or pull cars up a hump, from which they roll down onto the appropriate track. This is done to sort cars into different groups for their final destinations.
A hump yard is a type of railway yard that has a hump, which is a raised section of track. Cars are pushed or pulled up the hump by a locomotive, and then they roll down onto the appropriate track. This is done to sort cars into different groups for their final destinations.
A gravity yard is a type of railway yard that does not have a hump. Cars are moved around the yard by locomotives. This is done to sort cars into different groups for their final destinations.
A flat yard is a type of railway yard that does not have a hump or a gravity system. Cars are moved around the yard by locomotives. This is done to sort cars into different groups for their final destinations.