As an aside, in the Fall of 1956 some of us would be waiting for a bus to high school, by the North side of the Aurora National Bank. An SW/NW would come racing up the West Main headed for the incline and the coach yard. At the signal for that switch there would be a West Bound freight headed by either an O5/O5a or M4a. As soon as they got the board, they would start West. The grade favored them, but still a great sight. My afternoon job was at Sears, Roebuck & Co. store down the street a block. There was a stair landing between the second and third floors that had had a window that opened to overlook the Mainlines. I saw a number of freights pass with 05's on the headend.
That was the end of Mainline steam and I got to see it. At 11PM, there would be a steam (O5/M4) freight headed East that would call in the flagman at Aurora and then start out on the the Aurora hill. I used to go to sleep listening them leaving town.
They had suburban service West of Aurora, it was #33/34 to Mendota. They had seven cars out of Chicago and cut off 5 cars at Aurora. It didn't work out then and probably won't work down.