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How does one find the railway technical pages from the trainweb home page?

DW

"David Bennetts" <davibee@hotmail.com> wrote in message
news:oVdf9.3227$Sr6.111820@ozemail.com.au...
: The railway technical pages at www.trainweb.org will give you some
answers:
:
: "DC, on the other hand was the preferred option for shorter lines, urban
: systems and tramways.  However, it was also used on a number of main line
: railway systems, and still is in some parts of continental Europe, for
: example.   Apart from only requiring a simple control system for the
motors,
: the smaller size of urban operations meant that trains were usually
lighter
: and needed less power. Of course, it needed a heavier transmission medium,
a
: third rail or a thick wire, to carry the power and it lost a fair amount
of
: voltage as the distance between supply connections increased.  This was
: overcome by placing substations at close intervals - every three or four
: kilometres at first, nowadays two or three on a 750 volt system - compared
: with every 20 kilometres or so for a 25 kV AC line".
:
: Generally voltages were low on old systems because electrical gear was
heavy
: and bulky if needed to reduce voltages for the DC motors, designed to
: operate at around 600 volts.    1920s London tube stock for example had
: about a third of each motor carriage devoted to the control gear, if you
had
: to reduce voltage from the line supply with the technology then available
: you would have lost considerably more revenue space.
:
: Regards
:
: David Bennetts
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