Expected Behaviour
Three routes run on the map, where the divergence of the route happens between stations 4, 5, and 7:

• Route A (normal): Passes stations 1, 2, 3, 4, 5, 6
• Route A (express): Passes stations 1, 4, 5, 6
• Route B: Passes stations 1, 4, 7, 8

This figure clarifies the situation (Light green = A/express, Dark green = A/normal, Cyan = B):

We would expect the produced route map to look like this:

Actual Behaviour
The produced route map on all interchange stations look like this:

Reproduction Steps
See 'expected behaviour' above.

Environment

• Mod Version: MTR 1.19.3-3.2.0, no resource packs applied.

I know people don't often put them onto the same platform...

This is a bug?

if you make one of the green routes a "hidden route" the problem should go away

Additional enhancements:

• Show LRT/HSR icons
• Show station connections