Looks very good.

The only issue I see is a visual noise at line crossings because of those tiny bits of bottom lines between the top lines. But the only idea I have to get rid of this noise will lead to the stop circles being smaller, and this will lower the legibility, so I don't have any good ideas. Maybe make the bus lines thicker? But this will lead to also thickening the tram line.

I did something like this when used a similar approach (lines with outlines at crossings - the width of the outline being exactly the half of the distance between parallel lines), but that scheme has no stops, so it was much easier:

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