We have arrangement of movement cargo in SLR also. The difference between the two (VP & SLR), although both connected in same train is, time saving of 10-12 hours.
When train reach at destination SLR opened same time and unloaded at platform because empty train send at washing yard. But VP is not opened at platform, and opened at the location which has been allocated near station for loading and unloading. So its depends of availability of engine which pull VP to allocated location which took minimum 6-7 hours. Then it unloaded/ material segregated and send for delivery.
Many times it happens that if train reach approx 5 pm then VP send next day for unloading.