Need help here, What am I doing wrong

Long time player here, i have over 1000 hours in the game and I have beat it many times. But I have never made it into the late game and i keep getting caught up in the transition from main bus into city blocks. I think my problem is that I try to do both and they hamper each other. This is my first Space Age run and my base has been growing just fine, but then i started building a train network to the nearest iron deposit, but i think i over did it and my main bus is now out of space.

Are Bus and Train Block Systems meant to be an evolution of each other, should i only be using a bus until i outgrow it. I have run into this problem on most of my worlds. I think my mindset is just trying to juggle both systems when i should focus on one. Please help me understand how to make better use of the main bus and train systems without one blocking the other

https://preview.redd.it/oulxehde4wde1.png?width=1589&format=png&auto=webp&s=38b115c2a01f7e89ac4bd32dc04eb9831b8718f9

https://preview.redd.it/6ojjyhde4wde1.png?width=1903&format=png&auto=webp&s=f790d27b1becf3af77bb0fe653ad972bd1b55b4b

https://preview.redd.it/rk7lphde4wde1.png?width=1562&format=png&auto=webp&s=805de5b9e585aa397a06032a115914d288d49635