1997 aspect sequence

[Zaphod]

Also see another attempt which does follow this approach and is generally a good example of neat and clear presentation.
However
a) it rather leaves the question of YY at 107 undefined and
b) by suggesting that there is braking distance between 113 and 115 (perhaps 915m is enough but if so why is the spacing of the other 4 aspect signal on the plan that which is shown?) then makes one wonder why 111 is shown as displaying YY to 115 at R.

There should be no YY shown at 107 as the signal is not capable of displaying that aspect. Admittedly I would have expected to see the unused aspect head blacked out rather than just left white.