Levisham
The Snap tool has many function and how you set all the options is the key

- Terrain Snap Tool 01.jpg (36.99 KiB) Viewed 320 times
The three icons at the bottom are snap focus
Track is obvious for lifting the terrain to suit track level
The road is to provide cutting and embankments for roads
When doing a road under the track, set the track level and then change to road snap
With a fine brush setting 10 to 30 narrow base width between 10 to 20
Steep embankment angles you will form the cutting under the track
For railway embankments and cutting
Set Railway snap and set you embankment and cutting setting to suit the fall off you need
Say 60 to degrees for a steep cutting or 20 to 30 degrees for a shallow cutting or embankment
The shallower the setting the broader the brush needs to be for a true effect
The third option is procedural items like walls fences as the snap point
I dont find a huge difference in the round or square brush it the snap focus, angles and field of effect that are the key
Have a play its a cool tool but limited by tile sizes
For steep embankments and cutting lofts are the key to a nice look
These tools are more your roughing tools and you will still need to fine tune with the point tools for the best look
Cheers Ausc