Section 49A(10) in The West Bengal Factories Rules, 1958
(10)Loose-shunting :Loose-Shunting shall be permitted only when it cannot be avoided. It shall never be performed on a wagon not accompanied by a man capable of applying and pinning down the brakes. A wagon not provided with brakes in good working order and capable of being easily pinned down shall not be loose-shunted unless there is attached to it at least another wagon with such brakes. Loose shunting shall not be performed with, or against, a wagon containing passengers, live-stock or explosives.