Our power was out last night when I got home from work, so that's why you are seeing this several hours later than normal. This big steam pumper is a 1911 Nott owned by the New York City Fire Department. The Nott Fire Engine Company was a manufacturer of steam fire engines. In 1911 they began building complete gasoline powered fire trucks with both 4 and 6 cylinder engines. In 1912 they introduced a modern worm drive model, the Nott Universal, with a vee-shaped radiator. The last Nott fire truck was built in 1914. Park Olson had this 1st. Mike W sent this photo, and here is some info he received from the FDNY Fire Museum.
It was not a conversion. It was a 1911 Nott rear-axle chain drive with a new 750 GPM ALF Metropolitan steamer attached. They "weren't satisfactory" (possibly because of their combined weight),.FDNY stuck with Christie and Van Blerck 2-wheel front wheel-drive tractors instead, also factory-ordered with steamers, not conversions. (We have a 1911 Christie/Van Belerck on display here). Most old steamers were converted to electric searchlight rigs when tractor drives came into service, sold off to other dept's or scrapped in WWI.
Take care -- Damon
New York City Fire Museum