Just to explain...
In CTC we don't use the 1-block/2-block speed limits. Instead, the signals convey the information of two signals, the one right at the point (home signal) and the next signal (seen here as a distant signal). This, plus the speed limits on the blocks and switches and the length of the blocks, determines the speed profile for the next couple of blocks.
Another aspect is, that we don't have something saying when you see this signal you need to slow down to lets say 30 mph right away and then prepare to stop even though the train could slow down to make a safe stop sometime later. The only important thing at a signal is that the train has to obey the speed limit right at the signal, not at some point later - which would be essentially up to the discretion of the train engineer.
So, you will have a slowdown of the following train, but not because the train slows down right away if the next signal is stop, but rather the engineers knows that the next signal is stop, and how far away it is, keeps that in mind and is prepared to slow down and stop in time - until he is close enough to see that signal.
In future. it is planned to make the 2-signal conveyance more flexible - there are real life situations that for certain routes the distant signal information is not displayed - because the next signal is too far away. and a distant signal is (or is not!) present someway down the line. In stations, some tracks may not be approved for traveling through without stop. Also, cab signaling will be added sometime.
