Since 1999, Frits Osterthun is author of many articles and picturs concerning the German Railroad. He is specified in Era 1, the era of the so called Länderbahnen. He is author and co-author of many articles written on WorldRailFans.

A model layout in a German style of the late 19th century was made by him, known as Die Cochemer Bahn.

Since 1991 Frits is also working on a models list of all German steam locomotives in all scales, released by most well known European factories. Much of this work is published on his website of which the Models List is his opus magnus.