Quote:
Originally Posted by Nowhereman1280
Well when it gets to parts of the system that don't have GPS available it should be even easier. For example they could even use the cellphone receivers installed in the subway to tell exactly where the car is. The receivers are installed at equal increments so they could just install essentially a cell phone onto each car that would tell which antenna its closest too and then just send the location of that antenna to the traintracker system. When above ground they could just have the traintracker system triangulate the location of the car, or not even since the train travels along a fixed route, you have no need for triangulation since you can only be moving in one possible direction so the subway technique would work well here too.
Also, I don't see how this is that challenging. I mean I've looked into the booth at Howard that shows all the switches and train locations. Their signaling technology clearly knows where every train is, how does TrainTracker not know it? If they had to they could just hook whatever that computer I see is up to the TrainTracker.
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CTA already has a software system tracking trains, probably using proximity switches intergrated into the signaling system. I see it on in the attendent's booth of the Roosevelt Red Line Station all the time. A public version of train tracker would just have to convert this information into time estimates for display in stations. A Satilite based GPS is not needed.