I believe the actual equipment dates from about 1946. The Dinky also has the word "Olding" cast into the loading tray - this was the UK importer of these US machines. It was not self-propelled, and the toy has a tow bar to move it from site to site. The conveyor is moved by a crank on the side and the chute swivels to direct the material loaded. The loading tray can be elevated using a lever when the equipment is transported, and moved to ground level for loading. A blue gate in the tray can be removed.

I imagine the actual loader could have been used in a variety of ways. Remove the tray gate, and bulldoze gravel or sand into the tray, and convey it up to fill a dump truck or railroad car. Leave the tray gate in place, and transfer from one truck to another. I expect there were farm uses as well, to manually load sacks of grain or seed from ground level to a truck. Lots of play value here.

Barber-Greene went on to make a successful line of asphalt paving equipment. With the introduction of the front-end loader and increased use of pallets and forklifts, I suspect this style of conveyor-type loader faded away.