I’d assume this linear city would also involve a lot of bridging, since due to the width trains would basically almost be on top of each other. Trains crossing

I’d assume this linear city would also involve a lot of bridging, since due to the width trains would basically almost be on top of each other. Trains crossing perpendicular have to bridge maybe 6m at most. You’d have to bridge the entire length of city for this. And a fire would render any lines above or below unsafe to run until extinguished.