You can definitely do that. However on something like the underground that would complicate the "turn up and go" approach that most people take to the tube if

You can definitely do that. However on something like the underground that would complicate the "turn up and go" approach that most people take to the tube if you start skipping different sets of stations on different trains. It's something that's done, but I'm not sure how well it would scale on the tube if you did it a lot. Each train would need to miss roughly the same number of stops to prevent blockages or you need more passing places. With the small gaps between many tube trains the margin of error for scheduling can be very small. I think it's one of those things that works, but the advantage for the vast majority of people would be pretty small compared to the complexity and added fragility it would introduce if you tried to do it a lot.