GlennH
So was this operated only from a rail car? I see tracks on it but not the other vehicles and not sure how they can adjust azimuth. Looks great.
In practice the Germans would run a spur line to the general area wanted to dismount the vehicle from its train transport cars. It would trundle, slowly, to its firing position (the proportions of the tracks actually make steering extremely dificult due to the LxW ratio).
The Germans went to the trouble of cobbling up a PzKfw IV variant with a box superstructure to tote spare ammo to the beast. Which was a lot of work to only bring 10-15 rounds to the beast rather than a railcar load. And using a (semi)armored vehicle to bring ammo to something placed 3-5km behind front lines suggests a lack of practical thinking at upper planning levels. After all the crew was completely exposed to "work" the weapon.
The Germans were aware of the track radius issue too.