In article , J. Chisholm
scribeth thus
Kev Lawrence wrote:
"CJB" wrote in message
...
On Jun 23, 9:41 pm, "
wrote:
On 23 June, 19:45, CJB wrote:





On Jun 23, 7:05 pm, SB wrote:
Trains cancelled to Worcester. Trains cancelled to Wales and West
Country. Trains cancelled to Oxford and Bourne End and also to Henley.
All other trains subject to huge delays. Reason = 'signalling
problems' in the West Drayton area from last night = 'vandalism' in
the Iver area = Pikeys cut the signal cables to burn off the plastic
and sell the copper. SB

Is there not a way that a spare core or two of the cable could carry a nice
deterrent voltage to stop this?

(probably banned cos of elf n safety!)

Kev


A better way might be to have one core with an 'active' TDR ping.

Time Domain Reflectometry sends a pulse down a wire, and recieves a
reflection from any defect, be it conductor or insulator.

This way ('cos of speed of light..) you can tell instantly exactly here
a cable is being damaged, and signal control center could arrange for
police to arrive on site..

Err .. right.. Ever tried to get old bill to turn up with any urgency in
recent times?...

It wouldn't work just for theft, but for any location, say where water
was getting into insulators.

It wouldn't necessarily work for that either..

Think about it..

Jim Chisholm

--
Tony Sayer