They should colour it, like the roundels in London. Red for subway, green for GO, etc. Problem solved (although they won't do that)Sure, people eventually figure it out but that's a pretty low bar for wayfinding.
The problem is that the Metrolinx T is used for all modes - buses, GO trains, LRT, etc. It's a generic identifier for all transit. Not at all the way that London uses the roundel.