The above toy is a Marklin (Germany) from 1912 - 101 years young! It's 18" long or 458 mm. It has a "live steam" that produces pressure that pumps to the hoses. The water can then be releases through values. It's hand painted, and of course hand-made. I'm just taking the "choice words" from Bertoia auctions description, so you might want to go to the source and read the description for yourself. What was also written was that there are 5 of these outstanding toys that are known to exist as of 2013. also underneath, you can see the gear mechanism for being able to have the truck move.
This particular toy went to auction and garnered a final winning bid of $ 130,000.00 US - A true museum-quality antique!