Fahrpanzer [SEP] conflict
Fahrpanzer
The Fahrpanzer was a mobile artillery piece made prior to World War I in Germany, implemented in several German fortifications from 1890 onwards and exported to several foreign military powers prior to the outbreak of hostilities.
Specifications.
Beginning in 1878 the German industrialist Hermann Gruson's company located in Magdeburg, Germany specialized in the design and construction of armored gun turrets for fortifications. In 1892 Gruson's company merged with Krupp which greatly increased production capacity and the market for their designs. Gruson works turrets could be found in fortifications
in Austria-Hungary, Belgium, Denmark, Germany, and Italy. One of his companies products was the Fahrpanzer which was a type of mobile armored pillbox. 
As designed the Fahrpanzer was mounted on narrow gauge railroad trucks and was wheeled along military gauge tracks to its battle station. When not in use it would be pushed into a protective bunker to avoid damage during heavy bombardment. The Fahrpanzer was not autonomous: as originally designed it could only be pushed into place and rearmed from outside. It is not clear whether