Darth Smeg said:
Perhaps, but the actual shape of the galaxy is pretty flat. Sort of like a CD, but with a bulge in the middle.
So even though space is certainly 3 (or more) dimensional, you'll find most stars and their systems distributed on a more-or-less 2D plane. As for the discrepancies I don't mind so much. Mapping these things is a complicated and mystical pursuit, and nobody really understands it anyway
The thickness of the milky way averages 2000 light years- pretty far from 2D
I think I missed those facts... Anyways, my players had to take a 3 hour trip by commuter trains to reach the Coscarla district in "Edge of Darkness". In a following adventure where they had to follow a Logician´s agent back to his masters thay had to embark in the Tarsus Express, a nuclear plasma powered train, that did the trip between hives (with an small stop in Gunmetal) in 16 Hours.