Hello Alan!
I think that I will build a landscape that could be found in southern Sweden, Halland and Skåne , Denmark, Sjælland and Northern Germany, Schleswig-Holstein and Mecklenburg-Vorpommern. The reason for this is that I have trains that could have been seen in any of these areas.  I intend to run trains from DB about 1960-65, SJ about 1970, DR Städteschnellverkehr, Städteexpress and Interzonenzüge., SJ/NSB about 1988-1990, including "Alfred Nobel". And SJ/NSB 2007-, but of course not at the same time...
 
A little problem is perhaps that I have lot of DB 01, 012 and 03, were they ever used north of Hamburg? And were the DR 01.5 ever used north of Eastberlin, to Saßnitz or Rostock? I know that the 01.5s went to Hamburg.
 
I will keep you posted on any progress of my work.