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| London Transport (uk.transport.london) Discussion of all forms of transport in London. |
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#4
January 16th 15, 04:41 PM
posted to uk.transport.london
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TV alert: Silent Witness
On Friday, January 16, 2015 at 4:26:35 PM UTC, Roland Perry wrote:
SCD? Short Circuiting Device, essentially a conductive bar laid so as to connect the positive and negative current rails in order to trip the substation breakers if any attempt is made to energise the section. |
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