Looking SSE towards Ryan Tower across Nicholson Road with the Oak Creek (Carrollville) substation off to the left of the NB main. Signals in Background on the SB main are for Ryan Tower.

Thanks M. E. Moyano!

The first sub-station pictured, assuming that the North Shore Line did not have any more of that design, was located in Oak Creek, WI. It was located on the east side of Nicholson Rd. between E. Puetz Rd. and E. Ryan Rd. (WI Hwy 100). The sub-station was razed in the early 1970's.
Thanks to Karl Popodi for the ID.

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