Photo location id help sought

For many years, this image has hung in our volunteer office area inside the Rochester & Genesee Valley Railroad Museum's ex-Erie Railroad Industry depot.  

Over pizza after the Tuesday evening, September 7th, 2011 volunteer work session, a discussion was started amongst several volunteers as to where this photo was taken.   After lots of careful study down to carefully removing the 16"x20" print from its frame, an answer has still eluded us. 

There are four steam engines in the image.   On the left hand side, there appears to be a freight car lettered 'P&R' which could be Philadelphia & Reading.  Based on other contents, the image appears to date to somewhere around 1910 give or take a decade.   The R&GVRRM has received many donations from Rochester based General Railway Signal over the years, and we are thinking this may have come from them many years earlier.   Some have hypothesized that it may have been from around the Boston, Massachusetts area.   It has also been hypothesized that it is a SOCONY (Standard Oil Company of NY) storage tank at the left hand side of the image. 

With that said, we are looking for your help.   Do you know where this photo was taken?   If you have some idea, please drop us an note here or please feel free to make a post to our R&GVRRM Facebook wall.

Thanks for the help!