Signal cabins are to be so placed that the signalman may have a good sight of all points and signals actuated from his cabin, more especially facing points.
All signals are to be fixed on the left-hand side of, and as near as possible to, the road to which they apply, no signal or cabin, however, being erected at a less distance than 4 feet 6 inches from a passenger line of rails.
A distant signal for a cabin in advance must never overlap a home or starting signal for a cabin in the rear, but must be fixed on the same post, 7 feet below the home or starting signal, and be controlled by the home or starting signal, to prevent the distant arm being "off" when the home or starting arm is at "danger." When a distant signal is placed below a home or starting signal, no other signal must be placed on the same post, excepting "fog" or "calling-on" arms.
When the distant signals for a junction have to be combined with the home or starting signals for a cabin in the rear, then the starting signal post must be nearest the line with the distant arm for the right-hand junction placed under it, and the distant signal for the left-hand junction must be carried by a separate post to the left of the home or starting post. Both distant arms must be controlled by the home or starting signal. This rule will not apply if the junction to the right is a goods loop or other subordinate line; in this case, the distant signal must be carried on a separate post to the right of the home or starting post.
