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| Re: 3rd rail relocation -- Why? Chicago Pics (1167662) | |||
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Re: 3rd rail relocation -- Why? Chicago Pics |
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Posted by ChicagoPCCLCars on Sat Jul 21 15:04:44 2012, in response to Re: 3rd rail relocation -- Why?, posted by Avid Reader on Sat Jul 21 12:01:47 2012.  I gotta say I admire a person who appreciates good complicated trackwork. Right on! The photo is looking north through Clark Junction from the Belmont station platform about 1000 ft. away so there's a lot of compression in this telephoto shot....A LOT OF. I shot and reshot this, finally getting it in on Dot Net. The Brown line train is coming SB off the branch onto the four track north side main. The tracks are numbered one through four with one being the farthest and you really don't see four in the picture. The switches shown are all never used in normal moves through the plant. There are three sets of double crossovers and you can see two of them. If there was a blockage ahead on track one, then the Brown line train would be crossed over from one to two on the path you see. A SB Purple on one would do the same in the same situation. A SB Red on two would use this crossover to go from two to one to avoid a blockade up ahead. The crossovers between two and three would involve reverse running so they won't be used except in EXTREME emergencies! There is another double crossover to the right and farther down that IS USED for northbound Brown line trains that go from four to three and then diverge from three all the way over to go out the branch. That's a normal move. So because of the compression, there is no need for double slips....there's plenty of room and here's an uncompressed shot that shows that. Note that the tower has already put in the lineup for a NB Red line train on track three, the yellow over reds.  David Harrison |
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