Add North-South Link

[devinmatte]

We should show how great a world of regional rail would be with North-South link included

The question is do we add a toggle for both a world with and without it?

We will need timetables and proposed combined lines to make this work

[devinmatte]

We may not do this since it's not officially in the scope of the regional rail proposals

[github-actions]

This issue has been automatically marked as stale because it has not had activity within 180 days.