"Von Haus zu Haus" / "From Door to Door". These handy containers, which are trans-loaded in combination "Haus-zu-Haus" or "Door-to-Door" service from the road to the rails, are called "medium sized containers" in railroad jargon in Germany. The abbreviation "pa" container is also known; less well known is the origin of this abbreviation. "Porteur aménagé" in the UIC technical language of French means approximately "transport equipment" and designates the standard for the load surface and for the containers. There are different designs of medium sized containers in this same size range, and these designs are adapted to the characteristics of the freight to be transported - mostly liquids or powdered bulk freight.