[A]  Auto button provided for route indicated
[R]  Main route which is approach released from Red
[Y]  Main route which is approach released from Yellow
[1], [2], [3]  Preference order of alternative routes 
{ }  Intermediate signals which are pre-set for this route
nnnN  Indicates that points nnn are set Normal
nnnR  Indicates that points nnn are set Reverse

