Rather confused ... I have come across a diagram showing the dimensions of the German Schwerer Plattformwagen. Among the many measurements, it quotes the overall length as 10800 (with a bracketed figure of 124). The width is quoted as 3150 (bracketed figure 36). No units of measurement are given, so I am not sure what is meant here.

It's probably in mm. Not sure what the bracketed numbers are

Re: my recent query ... I think I have found the answer. 10800 divided by 124 = 87 (approx); 3150 divided by 36 = 87 (approx). The other measurements in the diagram have the same result. My thought is that the diagram is intended to indicate the required measurements for anyone wishing to scratch-build a model of the Schwerer Plattformwagen in 1/87 scale (HO).

Two links to help you and all the others who ask the same questions :
http://web.hs-merseburg.de/~nosske/EpocheII/e2xd.html and specially here :
http://web.hs-merseburg.de/~nosske/EpocheII/fg/e2f_gwkb.html

and :
http://www.modellbahnfrokler.de/archiv/100/
specially here :
http://www.modellbahnfrokler.de/archiv/100/06-s/html/100-132-ssym46.html
I'm afraid that all measurements are in millimeters...
pascal