There was a pair of Milwaukee Road main tracks (northbound/southbound mains) that ran past Wrigley Field then north of Waveland they consolidated down to a single track all the way up to the Buena Yard at Irving Park.
A spur came off the northbound main and traveled south along the west wall of Wrigley to almost where the box office is now. It was a team track. This spur was in place up until this line was abandoned in 1973 north of School Street.
On the west side of the main tracks was the Collins & Wiese coal yard which had its own yard. Old postcards show the Collins and Wiese coal yard with its silos and strings of freight cars alongside it. Milwaukee Road steam locomotives working the C&E used to refill their tenders there and take on water.
Collins & Wiese was taken down in 1961 and replaced by a parking lot and a restaurant later known as Yum-Yum Donuts. Yum-Yum was bought by the Cubs and the building used for storage until it was torn down in the recent past.
http://temporarytraveloffice.net/hollywood/ChicagoZineWeb.pdfI model in N-scale this area from Eddy Street north to Waveland Avenue including Wrigley Field as a flat with its western wall, circa the early 1970s.