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| Re: Chicago's Tower 18 (Photos) (1071469) | |||
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Re: Chicago's Tower 18 (Photos) |
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Posted by George Foelschow on Thu Jun 2 21:34:20 2011, in response to Re: Chicago's Tower 18 (Photos), posted by ChicagoPCCLCars on Thu Jun 2 17:44:03 2011. There are four decision points. Each point allows a train to proceed if a train is present. The points are selected, one at a time, in sequence. The decision points are 1: southbound Brown on Wells, 2: eastbound Green and Pink on Lake, 3: northbound Pink and Orange on inner loop Wells, 4: westbound Green and Brown on outer loop Lake. Rinse and repeat. One person directs the sequence and switches are manually set at points 3 and 4. |
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