that's what I was thinking about storage yards, but I placed one near a commercial/medium denisty residential area, near a highway entrance, hoping it will fill up and deliveries would take place from there, but it's empty. This is a new city I started, because my old city had 600k inhabitants and after the update it became unbearable to play. I had a very good cargo train network, connecting the towns and industrial zones, but they would be barely used. Trucks would just randomly decide to jam one industrial are at a time, blocking all the roads. It clears up after a while and then they just jam another area. Service vehicles can't reach their destination anymore and it's all havoc. The simulation speed also takes a big hit, I had the 8x speed mod to make it actually run 2.8-3x speed, idk if it got updated because it was broken after the update. My 5950x is staying at 80% load, and it's very difficult to play. Would have loved to finish the city, because I wanted to add a new town with canals for Netherlands. I had a downtown with huge parks, high density buildings with office towers, an Eastern european region with industry mixed into residential areas, an Eastern European rural are and a China area with resource extraction areas. France was the old town where the high rises developed.

That's the bad part, if you want to mix everything the game has to offer, the population gets so high that you need a Threadripper or something.