Funny how you take many things for granted without thinking about their evolution. So here is a question for those of you older and wiser than I.
Wartime RAF documents tend to list runways with a QDM value (useful for letdown procedures) but not with a specific runway ID. This leads me to think that ID's only appeared later and I am guessing it may be related to increased use of R/T over W/T with a need for more precise verbal communication. However this is only a guess and I would welcome any comments from this venerable list as to when runway ID's first appeared and when they became accepted as the norm.
I could ask why there are no runway markings on aircraft carriers but that will only bring up the subject of billiard tables on ships. javascript
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wink
JB