Hi - Got your question about B&OCT ownership and operation - I believe the ownership extended to Desplaines Avenue and then the B&OCT had rights on the CGW-owned track west of there to Bellwood, where there was an interchange with the IHB (around 25th Avenue).
There was an at-grade crossing of CA&E/CTA with the B&OCT (with CGW and Soo as tennants) east of Desplaines Avenue. That arrangement was superseded by the grade-separated alignments you see in place today. During the construciton of the expressway through Oak Park there was quite a bit of operation on temporary rights-of-way for both the "L" and the freight roads, with these arrangements shifting depending on where the expressway construction was. A new bridge for the CA&E over the Des Plaines river was installed to the north of the expressway, but was never used by them. It was finally removed several years ago.
West of Desplaines Avenue, the CA&E/CTA right-of-way strayed a bit south of the B&OCT/CGW alignment, and then came back parallel to it around 17th Avenue (if I remember correctly!). The CTA trains diverged south off the CA&E to the east of Mannheim Road to run on the Westchester Branch, while the CA&E also had a freight-only line in this general area, refered to as the "Cook County Southern." This interchanged with the IC, but also served on-line industries. It lasted to the end of CA&E freight operations, and operation over it was included in many of the later-day fantrips.
Hope this helps - have a great weekend! Art