Piko offers a unloading/loading bridge model, in H0 1/87 scale, under part number 61122.
It is possible to run a parallel track underneath the bridge in order to proceed with the loading of other hopper cars simultaneously.
Manufacturer Piko,
The German model train manufacturer, Piko, designs rolling models from model railroading in various scales (HO: 1/87 and N: 1/160). Founded in 1948, the company has a good know-how that they transmit in their design. Indeed, their miniature models are known to be very realistic and robust.
They manufacture various rolling products such as engines, cars and wagons. But also railway accessories such as tracks, rails, spare parts. Although they mainly produce models in 2 rails (direct current), they sometimes offer products under operating system 3 rails (alternating currents).
This company also produces a range of models mainly in HO 1/87 scale, rather focused on the German culture.
Finally, the company benefits from a second range named "Piko G", reserved for the design of product under G scale: 1/22.5.