Geeze Ron, have you forgotten about the Hohman Avenue crossing in downtown Hammond? Maybe the busiest and most convoluted grade crossing anywhere. See attached photo, c1940, looking northward. IHB's Hohman Tower (just out of sight to the left) controlled the interlocking, but crossing guards controlled the gates and auto traffic with hand-carried yellow stop signs and at night, lanterns. The tracks at the base of the photo are the Erie's on which the C&O exercised trackage rights. The 4 tracks across the photo in the center are the Michigan Central/IHB (NYC). The two tracks diagonally beyond them are the Nickel Plate. Then there's the MONON, out of sight at the bottom, but parallel to the Erie tracks. All mainline--no trolleys. Sixteen diamonds, about half of which were set right in the pavement. Plus, two side streets connecting with or crossing Hohman right amid all these diamonds. I think there was at least one train through here about every five minutes! Through passengers and long freights and transfers in and out of Chicago. Nothing else like it!