Issue description
There is familiar behavior for delete whole segment of any transport by holding Shift, but not for unity-build railwas.
Other transport could be built by unity just clicking on any point of line.
On the other hand, railways support segment select with Shift for delete and for no-stop/exlusive sections.
The same for copy and cut!
Please fix this annoying different behavior.
Delete - excelent!

But doesn't work for unity, copy and cut



Reproduction steps
- Plan any railway
- Try to quick build whole segment (not rectangle area)
Game version and build number
v0.8.1 b549
Operating system
Windows