Ok, so I am back stateside for a month and have done a little more exploring to try to solve this great mystery.
I went to the Buffalo Museum which was rather disappointing, but they did have a 1928(?) Sanborn map that covered the southern half of the area in question, but not the northern. It cut off at Davis Street. It did not show a station in this section and even included a building or two on the northern side of Davis, now Decatur. This is getting me to to think that the station was not there, despite hints mentioned previously why I thought it might have been.
The Sanborn map did show a waiting station to the eastern side right on Englewood next to the IRC tracks. Does not mention what company(y) it served but one would think due to its location the IRC. My limited knowledge of railroads is that companies did not like to share stations so it was built for the trolley.
So I walked the tracks again. Summer of course not a good time of year to sleuth due to the vegetation and all the insects which seem very fond of me. I did find the remnants of the base of the waiting station in the fielded plot that now sports an ugly billboard. I found nothing more where the Davis location is save the other set of old wooden stairs on the western Kenmore Ellwood side.
I then headed a bit north to the area where I thought the IRC station was. This was referred to in "Growing Pains in Ellwood" as the bright orange station a bit south of Harrison. The platform I believe is seen in the middle of the tracks in the 1927 aerial attached along with a mention of a station there in a circa 1900 map. Like my trip last November I found nothing. However, before I went I looked at the attached map again and saw something that I had not seen before. If you look closely to the right of the tracks to the south of the footpath there appears to be a dark roof to a fairly large building. In fact it looks like it overhangs that path a bit.
So moving my search away from the tracks a bit I found four little odd mounds that MAY have been part of a foundation of some building. They are now in a backyard extension as seen in the second attached photo. This roughly corresponds to the object in the photo in terms of location and how it was situated (but not perfectly). It looks in the photo like the owners have something on them.
If that building was the Erie Railroad station will require further investigation. It would not seem logical in some ways, but in others it does.
The 1893 articles state that the "already in use station" was to the near side of Ellwood. But another article states that it was in the midst of the soon to be developed Ellwood Park which was 72 acres on both sides of the tracks. A map exists from that time which shows street planned out for that area that were never developed. Hence, putting a station there would have been logical at that time.
A map circa 1900 also shows that Erie was using the eastern tracks at the time so putting a station there would make sense.
I do find it odd that despite all my searching for references the only mentions (besides the good detective work above) are all from the developer at the time of development. People were trying to unsuccessfully sell many of the lots they purchased for years after that, and think a station would show in at least a few of the pitches.
It is also possible that the building was built near the simple platform in the middle to store something. Most likely for Camp Kenilworth during the War or for the New York Rifle range nearby after the War. I found it odd in Growing Pains in Ellwood that the station was stated to have been painted bright orange. Was that common with stations at the time railroad gurus? Perhaps it was due to the fact that they fired towards the tracks just slightly to the south, and hoped the bright orange would deter recruits from inadvertently picking off unsuspecting waiting passengers and/or blowing up the ammo depot?
I really don't know what to think of the platform at Sheridan. Lots of digging but not one reference to it can I find despite the fact that it was at a rather infamous grade crossing. You cant see it on the map though a house and barn show clearly nearby. I would think it was a loading platform for agricultural products from before Sheridan was constructed in 1924-25.