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You have the basic system design concept. Trying to build it is difficult.
1. Wayside is based on the existing signal system if any; and Radio Telemetry to the dispatcher via a land line modem or radio transmission. Block Occupancy and detection is critical of any train traveling between two interlocks or block station. This also will be a major requirement.
2. Central Train Dispatching Server must monitor and issue all commands to the wayside interlock it is controlling and the trains approaching that interlock. It must provide critical information. Control of the interlock for traffic control. To the trains, it must provide safe train separation information or stop enforcement.
3. The dispatchers' Server and the On Board Computer must be programmed with appropriate algorithmns of essential train dynamics- such as train speed, direction of movement, braking capacity of the train ( deceleration rate), which is difficult on a 120 car freight train especially with all the pick ups and set offs that can occur , ruling grade, railroads signal block layout and safe braking distance tables. The dispatchers server must be updated with real time position and speed of the trains. The train length is critical for train separation and following moves on any railroad. On a fixed block signal systems, this can be done with standard track occupancy circuits; but not on moving signal block system.
All this must be constantly updated in real time and verified by/ through a vital hand shake software algorithmn; if the system is vital and to provide a positive stop enforcement.
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