Have a look at item 2 here :
http://postalheritage.org.uk/collections/museum/postalmechanisation/collecting
There was a combined throttle & steering tiller at the front. The postman walked in front holding this.
The recycling carts in Oldenburg and Bremen are smilar, with small shredders behind each slot.
I bet Peter Brough knows the proper name for a pedestrian controlled vehicle.