A few years ago I added modern distance marker signs around the layout. I decided I also wanted to have the old style cement markers that can usually be found along most German train tracks.
Some time ago I had come across a document that showed the original specifications (DV 843) for the distance markers from 1939.
The drawings define not only the size of the distance markers, but also, how they are to be placed along the tracks, and the distance from the rails, etc. This enabled me to design models that very closely match the prototype, as well as where to place them. I printed them on my 3D printer.
There are two forms of the distance markers, full kilometer stones without any hectometer indication, and then those that also include a hectometer distance below the full kilometer value, for example:
The markers with an odd hectometer value are placed to the right of the track (when travelling away from the origin point) as follows:
I made a pile of old marker stones in the engine yard...