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ABS does increase capacity, and dispatching efficiency, when trains are fleeted in the same direction, at least on the routes I've been able to observe. In unsignalled TWC territory on a certain UP route in the Northwest, multiple trains running the same direction usually get track warrants in short chunks at a time because their blocks can't be overlapped. Dispatcher and crews spend a lot of time on the radio, and trains end up being spaced a half hour or more apart, often having to stop until the guy ahead gives up his warrant. Any closer would require so many warrants being issued and released in such rapid succession as to drive everybody involved crazy. On a number of TWC routes I've seen where ABS signals are present, warrants for trains traveling the same direction can be issued simultaneously for the same strech of track, so trains run as quickly and as close together as the changing signal aspects will allow.
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