The first car has a speedometer.
Filling up the rear tank?
Yes, early 1915 model year cars -- why?
Note the 4 rivet front fender bracket on the right front fender of the first car. A carry over from the 1914 style of bracket. ref: http://www.mtfca.com/encyclo/F-H.htm#fen1
1914: Front fender bracket secured with four rivets (as in all previous fenders). Used from late 1913 to early 1915.
The Panama–Pacific International Exposition (PPIE) was a world's fair held in San Francisco, California, U.S., from February 20 to December 4, 1915. (Ref: https://en.wikipedia.org/wiki/Panama%E2%80%93Pacific_International_Exposition )
And Ford produced 18 cars a day on their assembly line ref:
"Henry Ford, who brought mass production
to American manufacturing and made the
automobile affordable to middle class
society, built an actual Model T assembly
line at the fair. Fords were produced three
hours a day, six days a week. " Ref the national park info flyer at: https://www.nps.gov/goga/planyourvisit/upload/PPIE_1915_0304.pdf
For additional information see an earlier posting at: http://www.mtfca.com/discus/messages/80257/90734.html?1255871963
If anyone has additional information on the Model T's produced there please let us know.
Hap l9l5 cut off
It is probably an exhaust hose coming from the rear.
It's MMO coming from a bulk tank...