$BL, $BELOW

Maximum depth of the foreground and background pictures below the vehicle(s).

The value input here determines in part the amount of space reserved on the screen for the movement on the screen.  If one or more foreground or background pictures are used which are higher in pixels than the amount specified by this parameter, the bottom of the picture is truncated to fit.  The same thing happens when the "container" of a command (the physical screen, the test window or the height parameter of a parent   $SECTION) is smaller than the value input.  The $BELOW parameter should therefore be in harmony with the container size for best results.  The corresponding opposite command is $ABOVE.

The default is seven pixels for the depiction of the right of way.  The default for the parameter when used with <DimensionParameters> is the default of the parent command.

For a $SECTION command this parameter specifies the size for the lines/sections contained inside the $SECTION; for a $GROUP command the own size. The $LINE command does not have such a parameter as all of the lines on the screen or inside a Section have the same sizes.  The $SCENE and $PATH commands do not have this parameter either because in a scene the tracks do not have individual background parts above/below the track and the background area is common for all the tracks ( $PATHs ) inside the $SCENE.