How to straighten the orbit of a linear object?

[WDL]

How to straighten the orbit of a linear object? Tunnels or double track tracks with tracks will be used during construction, and straightening tools cannot be used. I also suggest adding an automatic straight line function when laying the track, similar to TPF2

 

[JCitron]

How to straighten the orbit of a linear object? Tunnels or double track tracks with tracks will be used during construction, and straightening tools cannot be used. I also suggest adding an automatic straight line function when laying the track, similar to TPF2

The reason they can't be straightened is tunnel-splines are locked to the grid and are also classed as bridges. Bridges act totally different than regular track splines.

The alternative is to use spline tunnel walls, scenery-type tunnel entrances, some of which have dig-holes built-in, and a tunnel track placed inside the tunnel wall spline. If the tunnel entrances don't have built-in dig-hole objects, then you will have to place the dig-holes yourself and cover any holes up with splines and rocks to fill in areas that the entrance doesn't cover.

You can try setting a tunnel to kind track but you may lose the ability to dig the tunnel into the ground and this will require you to place dig-holes manually.