This is gorgeous! But just an idea, why not through-run some of the lines instead of terminating them at Union/Summerhill and forcing a transfer? That seems to be the direction most commuter rail systems go when they turn into a regional metro.
Another suggestion: "Réseau du Trains de Banlieue" isn't exactly correct, since I'm assuming that your map shows that our commuter rail network has been superseded by a bidirectional all-day service (and it should be de Trains instead of du Trains.) "Plan du Réseau de Trains", "Réseau Ferroviaire Régional" or "Réseau Express Regional" (if you want to copy Paris) would be more appropriate.
Sorry, just nitpicking.
Overall it looks amazing.
I noticed the mistake in my French when I did an exo (Montreal) map, just didn't correct the mistake here. I still think trains de banlieue applies here because it is still suburban rail, just more in the style of Paris' RER or Melbourne/Sydney Trains rather than strictly commuter rail. (Though RFR doesn't seem too bad)
Also I would have made the lines run through Union & Summerhill on the map/diagram if I was able to name them something other than "Line 1" or "Line A" (etc). In practice most trains would run through these main stations but with a slightly longer wait/dwell time.
Also I don't mind the nitpicking, usually nitpicking helps with marginal improvements which are always good. (I also nitpicked a map above myself)