Originally posted by Catt
I have had the incredible good fortune to simultaneously have 3 cities under my control which had both coal and iron within their radius! Ah, infinite power through unbelievable production, 3 cities producing stealth bombers in 2 turns . . . . Unfortunately, only one Iron Works may be built.
I would presume, however, that should the first Iron Works be destroyed, that you could then rebuild it in a qualifying city (as is true of forbidden palace and other small wonders).