The end doors of the VPU class 'Motor and Parcel Van'. The double hinge of the doors ensures that they can be opened in the narrow space created by another coupled VPU. The cars to be carried are supposed to drive through a string of VPUs with open end doors from a ramp at one end. Pune Jn, 2005-07-17. Apurva (iti@vsnl.com).