The Manhattan CBD is so special, so big and so complex that it could not be duplicated elsewhere, nor could any one of its major functions. And even if it were theoretically or physically possible to move any significant part of the CBD to another location, the cost would be so great as to eliminate it from serious consideration. There is not only a regional but also a national interest in seeing to it that Manhattan’s Central Business District works efficiently. We now turn to one of the essential elements in meeting this objective: an efficient regional passenger transportation system, including a well functioning, properly financed suburban rail network.