Ett gammalt ellok i USA (Järnväg allmänt)
http://www.prov.vic.gov.au/images/12800/12800-p0006-000028-020.asp
I ett australiskt forum hittade jag en länk till fotot.
The big clue is the electric commuter car in the foreground, the actual subject of the photo.
Check out "New Haven Power" by J W Swanberg, on page 321.
It is NYNH&H 068 a one off experimental unit built by GE in 1912. It had what was described as "Series-repulsion" motors and was GE's first AC locomotive.
It was the first NH electric locomotive withdrawn, in 1928.
The photo may have been used to examine the fitting of pantographs to clerestory roof vehicles (as used in Melbourne) and might date to 1912.
I Sverige kom ett par år senare litt Oa med sina jättestora motorer.