|I might not like Y/Y Advance Approach, but its better than Approach Diverging|
|There's something about green and yellow that just goes so well together.|
|Old school Restricting capable signal...mind the gap.|
|New NS signals always include the middle head.|
1980 and 1981 is Rule 305 or Diverging Route Clear, Approach Limited. Again this seems like one of those CTC related rules that was trying to fix the problem of back to back interlockings I mentioned before. In this case the Southern used the old Limited Speed Triangle to tell engineers they were diverging into a single block siding and should expect to diverge again. It appears the experiment was a failure as like I said no mention appears in the 1981 rulebook.
Moving on to dwarf signals R/Y for Diverging Approach is carried over leaving Y as the main Restricting indication. Fortunately the use of virtual signal heads means that a three lamp dwarf with the order R-Y-G can display R/Y Diverging Approach or Y Restricting. Like NORAC a 4th lamp is needed to display both Clear and Diverging Clear, but instead of G/G, the Southern employs G/R like the Western Roads. All indications have their own dwarf equivalent and moreover with the exception of Restricting all indications' dwarf signals mirror at least one high signals aspect.
|Even if one of the lamps is clearly more of an afterthought.|
Well with only 10 signal rules to cover that's pretty much it. Tune in next time for whatever it is I can find photos of.