Hello Melgar, I am sorry but I do not have any specific information about the layout during World War Two, I can only imagine that it has stay in service, it has not been damaged. Many German soldiers where also very interested in trains so may be it has help to preserve it.... who knows. Now all members from that period time are gone and it is very hard to have informations.
Thanks for the service your Father have done in France and help us to be free, and happy Fourth of July.
Kind regards, Daniel