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Two places (Chicago fans, listen up!): 1) DeVal interlocking in my home town of Des Plaines, Illinois. Three lines (UP Milwaukee Sub ex-C&NW freight cutoff from Proviso to Milwaukee; CN ex-WCL ex-Soo main line to Chicago; and UP/Metra ex-C&NW commuter operation) cross in a "triangle of diamonds", still worked from DeVal interlocking tower. About middling traffic density, and none too good photo angles, but just a nice place to go and railfan. 2) Brighton Park crossing (reachable via CTA's Orange Line.) Two lines - is it CN and NS? - cross here. Traffic density is rather high and the traffic is varied, and the location is clear from all angles for photos. What makes it interesting, though, is the method of operation. There is no interlocking! All trains must stop and receive a clear signal from the "switchtender." But that's not the half of it: the location is signaled by 11 original GRS 1904-patent swmaphores on brackets, worked by mechanical pipeline! Truly worth a visit for anyone who wants to see how it was done at the turn of the century. Additionally, the BNSF "racetrack" never fails to please!
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