Need help IDing this steamer

[GA_Dave]

While I'm certainly no expert on fire apparatus from this time period, let me take a stab at this.  What you have is actually a combination of two different things.  The tractor is a Knox-Martin Model 31, built between 1912 and 1915.  This one was used to motorize an older, horse-drawn steamer, which I believe is an Amoskeag.  There is a photo in a book I have that shows a 1913 Knox-Martin that was displayed at the 1913 International Association of Fire Engineers convention in New York City.  It also is pulling what I believe to be an Amoskeag steamer and looks very similar to the York apparatus.