I was told these tenders had a water tank around 3,000 litres. As they were not four wheel drive, they were not really designed for off road fires, but rather to back up pumpers at fires where hydrant access was a problem.
Yes ROB correct a city version of water tanker, as you mentioned for hydrant issues. They were also used for calls on car accidents when rescue vehicles didn't have a water tank. Manned by a crew of 2
Large urban tankers are very common in lots of countries where hydrant capacities on old established water distribution systems have not been upgraded to cope with decades of intensive urban development.
I can think of examples in Denmark, Poland, Portugal and Italy, as well as some areas of Germany - none of which are exactly third world countries!
Fortunately we do not have the problem in American cities, where 200 mm mains are commonplace, but we do suffer from it in small towns and rural areas all over the country.
Relays of numerous big tankers with 3000 or 3500 US gallon tanks are routinely deployed, but distances and response times often only result in what is known locally as “saving the foundations”….
Added by Jacques PETER on 09 May 2022.