**''[OB:''** ''[[picturename|<PictureName>]],[[xy|<X>,<Y>]],[[simple|<D>]]'' **'']''**

Overlay Behind

This is essentially the same as the **''[O: ]''** and **''[OT: ]''** modifiers except that the picture ''<PictureName>'' is placed **behind** the base picture, rather than instead of or in front of it.  This allows one to place a load onto a freight wagon but place it behind some parts of the base picture.  For example, one could place a load on a stake wagon and see the load behind the stakes. 

If the base picture is transparent, the same effect can be obtained by using the **''[O: ]''** command in tandem with a   ''<D>'' value.

There are 3 groups of similar modifiers.

The **''[[o|[O: ]]], [[ot|[OT: ]]], [[ob|[OB: ]]]''** modifiers put the overlay picture immediately on the specified position.

The **''[[ppbpt|[P: ], [PT: ], [PB: ]]]''** modifiers define the place for the overlay picture (usually in a macro definition), the overlay picture will be specified in a following modifier.

The **''[[ddbpt|[D: ], [DT: ], [DB: ]]]''** modifiers define both the position and the overlay picture (usually in a macro definition), the overlay picture will be placed only at the usage of a following modifier, having to specify only the name of the overlaying, a single word.