Sounds good to me - here's what I thought of to include as output signals:
- Current number of copies of the template
- Total number of trains (even not matching the template) that are scheduled to visit the station
- Number of trains currently under construction
- Number of train stations with this name
I'm thinking that this would work like the "read robot statistics" setting on roboports that are hooked to the circuit network, where you can select which signal gets sent for each of the available metrics.
For the combinator that will be needed to send the signals, I realized it might be a little smoother (and probably a bit better for performance) to have it be a constant combinator that's connected directly by circuit wire, instead of having a special requirement for where it's built.
I'm glad you and your audience like it! I should have some time to work on adding this feature (as well as getting sounds added for when trains are being built, which has been needed for a while) this weekend, let me know if you have any other ideas to improve this mod! Thanks again!