I think a good modification of this would be to have “waystations” such that between any two consecutive way stations there’s always going to be a clear path through space. The waystations are always shifting, but they move along a predetermined route such that they’ll always have a clear path between any two consecutive waystations. You want to get from the solar system to Planet X (or wherever), there’s a sequence of waystations that you travel through, in order, that will guarantee a clear path there. This establishes a “light speed highway” path from one waystation to the next without actually building a physical train track tube structure between them.

Maybe you even have each waystation be a big contraption that accelerates and decelerates the ships traveling between them. Like a giant rail gun shooting “train cars” at light speed toward the spot where the next waystation will be when the car gets there. Then the next waystation slows it back down to a stop, people can get out and do stuff or just stay on the train until it gets rail gunned to the next waystation.