Re: White Island Volcano New Zealand
If you go to https://natlib.govt.nz/collections# and in the search box put "Sulphur mines and mining" [include the inverted commas!]
you'll find a couple of online pics with side-tipping trucks, one being filled and one being pushed into the works.
Also the descriptions of several others not online and the magic words railway lines.
cheers Phil Rickard