
Locking of home signals approaching junction:

Lever    Requires              
-----    --------

  9      30 Normal, 31 Normal
 17      30 Reverse
 12      23 Reverse, 47 Reverse

Flank protection at junctions:

Lever    Requires              
-----    --------

 23     47 Reverse
 25     49 Reverse
 70     71 Reverse
 31     30 Reverse
 
Other:

Up Distant signals can only be cleared if route set throughout to Up Main line.

Lever 19 or 21 reversed locks levers 2 and 6.
