SCARM does not allow negative track heights and it is not possible to set track level to go under the baseboard/workbench. However, you can lift all the tracks at some base height and then set the desired track section below this “ground zero” height – that’s the whole trick.
Look at the sample HO layout below – it is shaped as figure “8″ with two tracks station and main line, passing trough it.
To make the passing line to go under the train station, you will need to lift up all the tracks to let say 80mm (about 3,15″).
|To set all track heights at some level, select all the tracks, select some height marker in the selection (no matter which), adjust its value and press Enter.
If you already have set heights and slopes for the tracks and objects in the layout, you can select everything (Ctrl+A) and then lift up the selection using the “Height shift” tool from the Toolbox (in menu “Tools”).
Then you will be able to lower the level of the passing line to zero and to place a tunnel under the train station.
It is also possible to make the two tracks of the station to pass over on a bridge.
Use this trick whenever you need to place some track section below the zero level of the baseboard/workbench. Remember to set the mode of the line (i.e. in tunnel) in order to be correctly displayed in 3D viewing mode. Download the sample layout from the links below and experiment with it.