On Sun, 30 Nov 2008 08:04:16 -0800 (PST) someone who may be Mr Thant
wrote this:-
Crocodile clips or something, and how to use them, in glossy brochure
form:
http://www.tubelines.com/whatwedo/tr...ing_device.pdf

Figure 3 of
http://www.raib.gov.uk/cms_resources/2008-02-28_R052008_Merstham.pdf
is a photograph showing a third rail version of the same thing. The
design with the large wooden arm is partly to make it unlikely it
will be thrown off if the conductor rail is re-energised. It also
helps push the metal through the crud on the underneath of the
conductor rail.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54