Hi Gebirgsmarine!
The models were built from fine mechanical construction kits from English and German production. They work like real steam engines. Gas heating, boil water, feed oil and drive. They must be assembled and set to work.
The photos are a part of the collection. During assembly you learn a lot about metalworking, have to build some parts yourself and learn all kinds of soldering and painting. . .
Some locomotives have been shown in operation at exhibitions in Germany and France (Paris).
Best regards
Thomas