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Post by cj2003 on Feb 14, 2006 9:14:12 GMT
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Post by Deleted on Feb 14, 2006 13:24:32 GMT
I see they are talking about getting rid of the tunnel telephone wire system "now that it has been superseded by cab-secure radio". Apparently it is "an anachronism and an unnecessary cost".
It's also the only alternative means of communication in a tunnel if the train radio fails! No matter how good the new radios are, they aren't going to be failsafe.
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Post by trainopd78 on Feb 14, 2006 13:58:04 GMT
They seem to be forgetting its other primary fuction of getting the juice off in an emergency. What they going to do to replace that function?
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Post by Deleted on Feb 14, 2006 14:07:01 GMT
They seem to be forgetting its other primary fuction of getting the juice off in an emergency. What they going to do to replace that function? "A simple circuit breaker cable that can be broken by the driver, but the cable is sheathed and therefore cannot be used for a telephone connection" |
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Post by Deleted on Feb 14, 2006 14:26:29 GMT
I read with interest that an alternative on other metro systems is the use of sheathed (insulated) cable, where the driver can break the circuit but cannot clip a telephone to it. I find it quite remarkable in todays technology that a telephone can't be designed with a special type of connector that can fit around the cable with 2 bayonet type connectors that can be pushed through the insulation onto the conductor wires using a special crimping tool.
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