Funny little set up this:
The 44 gallon drum is full of diesel and fuels the pump … to pump irrigation water. When the drum runs low (not out because you shouldn’t run a diesel engine dry) the ‘person’ simply disconnects the drum and rolls it (to the left. Notice the drum would run off at trailer/ute height) off the wooden rails and rolls a full one back into place for reconnection. Smart set up.
This one was done with a smart little orange/sepia fine point from TYPO in the Canberra centre … two for $5.