Dave, I checked in the June, 1930, and June, 1955 issues of the Guide, and found the following information:
In 1930, the C&A, NKP, and Big Four used a station in common (called C&A Jct. on the Big Four, C&A Crossing on the NKP, and Bloomington on the C&A). The NKP and Big Four had another station which they called Bloomington, 0.8 miles away. The IC station was one mile from the C&A station, and about 1/2 mile from the Illinois Terminal station, which was 3/4 mile from the C&A station; there is no distance given between the IC and the NYC/NKP stations.
By 1955, only the NYC and GM&O are listed as having passenger service into Bloomington, with both using the same station. By then, the Big Four (actually P&E) was usually identified as being NYC, and the C&A was a part of the GM&O.
From the Streets and Trips map of Bloomington, the GM&O/NYC station was at the southwest corner of the intersection of Washington Street and Western Avenue, right where the NS (NKP) and UP (GM&O) cross.
I hope this helps you.