Is your feature request related to a problem? Please describe.
The rectangular tunnels look great, but they aren't always realistic for metro tunnels.

Describe the solution you'd like
I'd like to see circular tunnels.

Additional Information

The base has 3 cubes floor that will allow using the 3 blocks bridge item.

Ow ok

You can use this
It adds Circular Tunnels

They mean to have the tunnel wall, tunnel and bridge creator do circles

You can achieve this with the different tunnel creator sizes.

maybe u can use a one-meter depot train(or what
你也许可以用一个一米的车厂列车

This can now be achieved using custom OBJ models for tunnels. Closing this for now, thanks.