Ok...so I was told to consult the Almighty Google...great. I know it was an 800 caliber gun, took forever to reload, and both (Dora and Gustav) were destroyed. Tyrannis is the only one who read both questions, it would seem 
How do you think it would fare in AH?
Honestly it wouldn't be in Aces high at all. Here's a little info on the Dora Gun - it took over 2500 men to help build the Embankment and lay the tracks for the gun, along with over 250 to set up the Gun for firing, also supporting this massive waste of resources was 2 flak batteries for air defense.
Also this massive gun really only fired a handful of times each time, problem with aces high although we have the shore batteries with a Line of sight and they fire directly at the target, where this railroad gun fired indirect - I would assume it would be aimed like an 8 inch gun without any line of sight, you click on the map and fire away and wait however long for a reload.
Its a wonder weapon like the Nukes or V-2 - neither will see Aces High, but nevertheless really cool to research.
