Excellent detective skills, ns_kid! You and K-Man have opened up a whole new section of local history that I had not been aware of, and I am grateful. There's a lot of info there to absorb and I look forward to reading through all of it again, and will post if I can add to it (likely not as you two have been most thorough).
Last night I found myself driving by this section of Barrington, and as I was passing Mulgrave Park I could almost picture that old station in that location. I have driven by there countless times in the past, not really thinking about what may have been there before, but now I will never look at it in the same way again. Very cool stuff.