I’m a big believer in trains, but I think a lot of train systems are too busy. Making sure the trains are full before they move, making sure they can be unloaded fully when they arrive, reducing the total number of trips. I think single lane works. Or at least in my bases it works.

Dual track designs have more intersections, and opportunities for deadlock, you still have to build up passing sidings, for the larger intersections.

But it’s great to experiment either way. I was on a big multiplayer map, and I just started playing with the single tracked design and I got more throughput than the dual and quad carriageways that some of my friends had made. And then I was hooked. :)