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The PATH subway system between NYC and NJ has been boasting on little ads inside the cars that they are implementing communications-based train control and posi
by Fej 9y ago
The PATH subway system between NYC and NJ has been boasting on little ads inside the cars that they are implementing communications-based train control and positive train control. How would positive train control work underground, if it's GPS-based?
- niftich 9y agoIf I accurately recall, PATH is rolling out Siemens Trainguard MT; a Communication-Based Train Control (CBTC) system which uses trackside (between-the-tracks) beacons and in-car equipment. Radar is used to figure out the vehicle's distance from the beacons. The system communicates using a wireless-and-wired network to a control center and keeps track of mobile blocks. Here's a brochure [1]. I'm not entirely sure, but I think GPS isn't used in Trainguard -- which makes sense; the beacons know where they are in relation to the track geometry, and locations only need to be resolved in track-space. [1] http://www.mobility.siemens.com/mobility/global/SiteCollectionDocuments/en/rail-solutions/rail-automation/train-control-systems/trainguard-mt-en.pdf http://www.mobility.siemens.com/mobility/global/SiteCollecti...