I don't think a surface level station is planned, as it would take up a large area. The sub portal one can be lead up to the surface just outside the city, and continued either at ground level or elevated.
You were not here for SG6, but it had an extensive rail system with large stations at 24 locations in a grid on the very large map. It took something like 45 minutes to get from corner to opposite corner. The building of this very beautiful railroad cost the server a few members, and the rest of the builders were deterred from doing a project like that again.
If anyone wants to build rails moving through the landscape, it should probably be decided by the veterans what routes can be used.
Should it be from portal to portal, or can it be from build to build? I can see very clear advantages in both, but I would suggest a rail line from build to build in a not planned spiderweb. The rail line would not be the principal way to get somewhere, and if it moves from build to build, you can choose the route you'd like to explore and experience.
Be who you are, and say what you feel, because those who mind don't matter, and those who matter don't mind.