Talk:Communication-based train control

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The content of this page is correct mainly but I feel compelled to contribute to it as it lack some important details.

I just happen to work in the Railway Transportation Signaling.

Epvo 23:03, 4 December 2006 (UTC)

[edit] Loops are used on Paris Métro Line 14

The CBTC system in operation on the Paris Métro Line 14 uses loops for communications between on-board computers and ground-based computers. The loops are in plastic sheaths (? plastic ducts? I don't know the right word) which have a rectangular section (approx. 10 cm x 3 cm). They are laid within the four foot area, but not on the center line of the track. You can see the "transmission ducts" in white on this picture [[1]](picture from the test track that has been dismantled since then). AldoSyrt 15:47, 7 July 2007 (UTC)

[edit] CBTC systems can be distributed systems

The wording of the article could let one thinks that all CBTC systems use a central off-board computer. That is not the case for the CBTC system used on the Paris Métro Line 14 and for the New York City Canarsie Line. For these CBTC systems there are several off-board computers, each one governs a part of the line (distributed computer system). For these two systems the computers are located along the line in signalling rooms (geographically distributed), but they could have been located in one central room. I would like to edit the article and enhance it but I am not a native English speaker and my English is not fluent, not to mention my poor grammar. I make only slight corrections. AldoSyrt 16:12, 7 July 2007 (UTC)