61. The engine-driver shall give three short whistles when he requires
the brake-van brakes to be put down, and one short whistle when they are
to be released. When he requires facing points to be set for the main
line he shall give two, and for a branch or siding three medium whistles.
A whistle continued for several minutes is a call for assistance, and
workmen within hearing should at once proceed to the spot.
62. A red light is a signal to stop; a green light, to proceed
cautiously; and a white light, to go a-head. In shunting, a green light,
if waved up and down, is a signal to move a-head; if from side to side,
to back.
63. It is important that all persons having to do with shunting
operations should understand that if an engine is either in contact with
no vehicles, or has vehicles both in front and behind, it is said to go
a-head when it moves chimney first, and to back when it moves fire-box
first. If in contact with vehicles at one end only, it is said to go
a-head when it draws and to back when it pushes such vehicles, without
regard to its own direction.