I don't want to rain on the parade, but may I suggest that you give this plan some very serious study before starting? As one who has a functional block signal system on my modest sized layout, with 32 signals, I can tell you that there are two components:
- the signal system, and
- the rest of the layout and all the trains.
This is just my opinion, but you appear to have chosen a "lite" version of speed signaling. Speed signaling is somewhat more complicated than route signaling.
Prototype speed signaling is designed to require a train to reduce to a safe speed for whatever is coming next -- stop at next signal, proceed through a turnout that is designed for a specific maximum speed, proceed at Restricted Speed, etc. Model trains don't need all these aspects because, for one reason, you almost certainly will not have the full array of different length turnouts, and model trains are not as speed sensitive as to derailing, as are prototype trains.
Route signaling, on the other hand, indicates action to be taken in the block and at the next signal -- proceed, proceed on diverging route, approach, stop-and-proceed, stop. It requires a reduction in speed for some indications, but is normally only either maximum authorized speed, 30 MPH, or Restricted Speed.
Model trains don't need all the aspects of speed signaling, and a route signaling system can avoid the use of 3-unit signals with their more complicated aspects. Route signaling aspects are logical and understandable.
Who is going to run the trains in compliance with signal aspects? You seem interested, but will others have any idea what to do if their train encounters a red-over-flashing green-over flashing red aspect?
The relays will be somewhat more complicated with speed signaling. I see by your profile that you are an Engineer. Hopefully, that would enable you to understand how to install a signal system. The equipment you have chosen appears to be able to control the signals if you have the skill and patience to properly wire and program it.
You could easily spend several thousand dollars on the signal system you describe, with such a large number of signals.
It's your layout and your money, but I would strongly suggest that you talk with others who have installed prototypically operating signals on their layouts, before you make a commitment. Trainworx recently built a layout for a fellow who wanted the full array of CSX aspects. They could help you get in touch with him if you desire to find out what he uses, how well he likes it, how well it works, and how much of his retirement money went into the signal system.
This is the relay board for only one sixth of the number of signals you are wanting to use. There's a cable from the circuit board out to every signal, and additional cables daisy gaining the signals together. There must be an track circuit for each block, with two insulated joints per block. A signal system (as differentiated from "some signals") is impressive, but it's not a bed of roses. Good luck.
