Thank you Bgray Seems to show a railgun with such a small diameter as to be only useful for defense not bombardment.
It's really hard to read scale on this, but that gun could easily by in the vicinity of 120 to 150mm, which is plenty big for a railgun, where muzzle energy matters more than diameter. The USN's current 32MJ demonstrators have bore sizes around 60mm, and that's plenty of muzzle energy to hit shore targets as well as aerial ones.
260 and 360 photos are BS from Panchenko model shop. last one should represent advanced Soviet bomber project (silhouette is made from Paralay's rough drawings based on TsAGI WT model).
Pictures are from poorly written article where author has gathered all the myths of advanced Soviet and Russian projects, mixing mostly BS with bits of real info available from other sources years ago, even without proper attribution.