Ian, thank you so much.
I had thought this was a long shot, and that I probably wouldn't hear from anybody: so this is great.
Are you a Danish speaker?
Now, if I understand properly, J.S.Louth was originally employed to run the Schleswig Holstein Railway, but moved on to manage another Danish railway when SH became part of Prussia.
This is news to me. I thought he returned to England when the Prussians took over.
Danny